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Back in the days when I started to learn c I had an assignment to print all the prime numbers between 1 to 100 but didn't know how (with if/for/while)
So I searched Google for "prime numbers from 1 to 100" and used printf to print them on the screen
I got an A+7 -
So I cracked prime factorization. For real.
I can factor a 1024 bit product in 11hours on an i3.
No GPU acceleration, no massive memory overhead. Probably a lot faster with parallel computation on a better cpu, or even on a gpu.
4096 bits in 97-98 hours.
Verifiable. Not shitting you. My hearts beating out of my fucking chest. Maybe it was an act of god, I don't know, but it works.
What should I do with it?241 -
Is it weird that whenever a slightly dodgy site asks for my address, I give the address of the prime minister:
10 Downing Street
Westminster, London
SW1A 1AA, UK8 -
My CS professor just told my class of 200 people that 1 is a prime number.
You can practically hear centuries of mathematicians rolling over in their graves7 -
I fucking hate Apple products now.
iPhone 5s time was Apple's prime.
Now it's just a company living off the momentum of its old products.
iPhone X.. really ? the notch ?7 -
!(short rant)
Look I understand online privacy is a concern and we should really be very much aware about what data we are giving to whom. But when does it turn from being aware to just being paranoid and a maniac about it.? I mean okay, I know facebook has access to your data including your whatsapp chat (presumably), google listens to your conversations and snoops on your mail and shit, amazon advertises that you must have their spy system (read alexa) install in your homes and numerous other cases. But in the end it really boils down to "everyone wants your data but who do you trust your data with?"
For me, facebook and the so-called social media sites are a strict no-no but I use whatsapp as my primary chating application. I like to use google for my searches because yaa it gives me more accurate search results as compared to ddg because it has my search history. I use gmail as my primary as well as work email because it is convinient and an adv here and there doesnt bother me. Their spam filters, the easy accessibility options, the storage they offer everything is much more convinient for me. I use linux for my work related stuff (obviously) but I play my games on windows. Alexa and such type of products are again a big no-no for me but I regularly shop from amazon and unless I am searching for some weird ass shit (which if you want to, do it in some incognito mode) I am fine with coming across some advs about things I searched for. Sometimes it reminds me of things I need to buy which I might have put off and later on forgot. I have an amazon prime account because prime video has some good shows in there. My primary web browser is chrome because I simply love its developer tools and I now have gotten used to it. So unless chrome is very much hogging on my ram, in which case I switch over to firefox for some of my tabs, I am okay with using chrome. I have a motorola phone with stock android which means all google apps pre-installed. I use hangouts, google keep, google map(cannot live without it now), heck even google photos, but I also deny certain accesses to apps which I find fishy like if you are a game, you should not have access to my gps. I live in India where we have aadhar cards(like the social securtiy number in the USA) where the government has our fingerprints and all our data because every damn thing now needs to be linked with your aadhar otherwise your service will be terminated. Like your mobile number, your investment policies, your income tax, heck even your marraige certificates need to be linked with your aadhar card. Here, I dont have any option but to give in because somehow "its in the interest of the nation". Not surprisingly, this thing recently came to light where you can get your hands on anyone's aadhar details including their fingerprints for just ₹50($1). Fuck that shit.
tl;dr
There are and should be always exceptions when it comes to privacy because when you give the other person your data, it sometimes makes your life much easier. On the other hand, people/services asking for your data with the sole purpose of infilterating into your private life and not providing any usefulness should just be boycotted. It all boils down to till what extent you wish to share your data(ranging from literally installing a spying device in your house to them knowing that I want to understand how spring security works) and how much do you trust the service with your data. Example being, I just shared most of my private data in this rant with a group of unknown people and I am okay with it, because I know I can trust dev rant with my posts(unlike facebook).29 -
Me: I don't spend the prime of my life watching series, I code, I develope, I learn
* Discovers Silicon Valley *
😓6 -
There is NOTHING more satisfying than having an algorithm suddenly click while you are in the shower.
I got a program for determining Prime Numbers using Extended Euclid Algorithm from ~2 to .28 seconds <35 -
A few weeks ago at infosec lab in college
Me: so I wrote the RSA code but it's in python I hope that's ok (prof usually gets butthurt if he feels students know something more than him)
Prof: yeah, that's fine. Is it working?
Me: yeah, *shows him the code and then runs it* here
Prof: why is it generating such big ciphertext?
Me: because I'm using big prime numbers...?
Prof: why are you using big prime numbers? I asked you to use 11, 13 or 17
Me: but that's when we're solving and calculating this manually, over here we can supply proper prime numbers...
Prof: no this is not good, it shouldn't create such big ciphertext
Me: *what in the shitting hell?* Ok....but the plaintext is also kinda big (plaintext:"this is a msg")
Prof: still, ciphertext shows more characters!
Me: *yeah no fucking shit, this isn't some mono/poly-alphabetic algorithm* ok...but I do not control the length of the ciphertext...? I only supply the prime numbers and this is what it gives me...? Also the code is working fine, i don't think there's any issue with the code but you can check it if there are any logic errors...
Prof: *stares at the screen like it just smacked his mom's ass* fine
Me: *FML*12 -
The list would be quite long.
I think Google is still making good tools, but just like Apple the integrations get all so tight and constricting... And with their data, if it goes wrong, it will go wrong hard.
I feel like YouTube is gliding into a state where cheap clickbait floats to the top and finding quality gets more difficult as well, their algorithm is more and more tuned to choose recent popular stuff over good older gems.
Microsoft is all pretend lovey dovey cuddling open source, but I'm still suspicious it's all a hug of death. I was never a big fan, but they're seriously dropping balls when it comes to windows-as-a-service, taking away so much personal control from end users even though they can't be trusted to babysit either.
Amazon is creeping it's way through the internet, charging $10/m to join the vip club infesting houses with spytubes to sell more plastic crap. Bezos' only right to keep wasting oxygen is BlueOrigin, but he'll probably fuck that up as well turning spaceflight into a decadent prime consumer orgy instead of something inspiring.
Facebook... Well, that's self explanatory. Fuck it, everything it pretends to be, and everyone who still has an account with a rusty spike.
Uber and AirBnB, with their fake ass mission of a green shared economy, but they trample over employees, customers and neighbors to build their ivory towers of progressive illusions.
Then there's a million declining brands.
I liked Skype for example when it was first released, Just like how I started out liking (and then hating) Discord, Slack, etc... They're all tools which seem fast and easy, but then they get us further away from solid protocols, get us entrenched into limiting, bloated and sometimes even dangerous tools. As my dad used to say: "Companies are like women, if you go for cheap, fast and easy you'll end up with a burning dick and half your savings gone"
You know what, fuck all tech companies.
OK, devrant is still pretty nice... For now.8 -
Happy 0x7E2!
Fun fact:
2018 = 2 x 1009 (both prime)
8102 = 2 x 4051 (both prime)
Let we all finiah at least one side project this year!11 -
Not having finished any education, and writing code during interviews.
I have a pretty nice resume with good references, and I think I'm a reasonably good & experienced dev.
But I'm absolutely unable to write code on paper, and really wonder how some devs can just write out algorithms using a pen and reason about it, without trying/failing/playing/fixing in an IDE.
Education I think.
I can transform the theory on a complex Wikipedia page about math/algorithm into code, I can translate a Haskell library into idiomatic python... but what I haven't done is write out sorting functions or fibonacci generators a million times during Java class.
I don't see the point either... but I still feel utterly worthless during an interview if they ask "So you haven't even finished highschool? Can you at least solve this prime number problem using a marker on this whiteboard? Could you explain in words which sorting algorithm is faster and why?"
"Uh... let me fetch a laptop with an IDE, stackoverflow and Wikipedia?"22 -
I messaged a professor at MIT and surprisingly got a response back.
He told me that "generating primes deterministically is a solved problem" and he would be very surprised if what I wrote beat wheel factorization, but that he would be interested if it did.
It didnt when he messaged me.
It does now.
Tested on primes up to 26 digits.
Current time tends to be 1-100th to 2-100th of a second.
Seems to be steady.
First n=1million digits *always* returns false for composites, while for primes the rate is 56% true vs false, and now that I've made it faster, I'm fairly certain I can get it to 100% accuracy.
In fact what I'm thinking I'll do is generate a random semiprime using the suspected prime, map it over to some other factor tree using the variation on modular expotentiation several of us on devrant stumbled on, and then see if it still factors. If it does then we know the number in question is prime. And because we know the factor in question, the semiprime mapping function doesnt require any additional searching or iterations.
The false negative rate, I think goes to zero the larger the prime from what I can see. But it wont be an issue if I'm right about the accuracy being correctable.
I'd like to thank the professor for the challenge. He also shared a bunch of useful links.
That ones a rare bird.21 -
Today, for fun, I wrote prime number generation upto 1000 using pure single MySQL query.
No already created tables, no procedures, no variables. Just pure SQL using derived tables.
So does this mean that pure SQL statements do not have the halting problem?
Putting an EXPLAIN over the query I could see how MySQL guessed that the total number of calculations would be 1000*1000 even before executing the query in itself and this is amazing ♥️
I have attached a screenshot of the query and if you are curious, I have also left below the plain text.
PS this was a SQL problem in Hackerrank.
MySQL query:
select group_concat(primeNumber SEPARATOR '&') from
(select numberTable.number as primeNumber from
(select cast((concat(tens, units, hundreds)+1) as UNSIGNED) as number from
(select 0 as units union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) unitsTable,
(select 0 as tens union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) tensTable,
(select 0 as hundreds union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) hundredsTable order by number) numberTable
inner join
(select cast((concat(tens, units, hundreds)+1) as UNSIGNED) as divisor from
(select 0 as units union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) unitsTable,
(select 0 as tens union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) tensTable,
(select 0 as hundreds union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) hundredsTable order by divisor) divisorTable
on (divisorTable.divisor<=numberTable.number and divisorTable.divisor!=1)
where numberTable.number%divisorTable.divisor=0
group by numberTable.number having count(*)<=1 order by numberTable.number) resultTable;
9 -
POSTMORTEM
"4096 bit ~ 96 hours is what he said.
IDK why, but when he took the challenge, he posted that it'd take 36 hours"
As @cbsa wrote, and nitwhiz wrote "but the statement was that op's i3 did it in 11 hours. So there must be a result already, which can be verified?"
I added time because I was in the middle of a port involving ArbFloat so I could get arbitrary precision. I had a crude desmos graph doing projections on what I'd already factored in order to get an idea of how long it'd take to do larger
bit lengths
@p100sch speculated on the walked back time, and overstating the rig capabilities. Instead I spent a lot of time trying to get it 'just-so'.
Worse, because I had to resort to "Decimal" in python (and am currently experimenting with the same in Julia), both of which are immutable types, the GC was taking > 25% of the cpu time.
Performancewise, the numbers I cited in the actual thread, as of this time:
largest product factored was 32bit, 1855526741 * 2163967087, took 1116.111s in python.
Julia build used a slightly different method, & managed to factor a 27 bit number, 103147223 * 88789957 in 20.9s,
but this wasn't typical.
What surprised me was the variability. One bit length could take 100s or a couple thousand seconds even, and a product that was 1-2 bits longer could return a result in under a minute, sometimes in seconds.
This started cropping up, ironically, right after I posted the thread, whats a man to do?
So I started trying a bunch of things, some of which worked. Shameless as I am, I accepted the challenge. Things weren't perfect but it was going well enough. At that point I hadn't slept in 30~ hours so when I thought I had it I let it run and went to bed. 5 AM comes, I check the program. Still calculating, and way overshot. Fuuuuuuccc...
So here we are now and it's say to safe the worlds not gonna burn if I explain it seeing as it doesn't work, or at least only some of the time.
Others people, much smarter than me, mentioned it may be a means of finding more secure pairs, and maybe so, I'm not familiar enough to know.
For everyone that followed, commented, those who contributed, even the doubters who kept a sanity check on this without whom this would have been an even bigger embarassement, and the people with their pins and tactical dots, thanks.
So here it is.
A few assumptions first.
Assuming p = the product,
a = some prime,
b = another prime,
and r = a/b (where a is smaller than b)
w = 1/sqrt(p)
(also experimented with w = 1/sqrt(p)*2 but I kept overshooting my a very small margin)
x = a/p
y = b/p
1. for every two numbers, there is a ratio (r) that you can search for among the decimals, starting at 1.0, counting down. You can use this to find the original factors e.x. p*r=n, p/n=m (assuming the product has only two factors), instead of having to do a sieve.
2. You don't need the first number you find to be the precise value of a factor (we're doing floating point math), a large subset of decimal values for the value of a or b will naturally 'fall' into the value of a (or b) + some fractional number, which is lost. Some of you will object, "But if thats wrong, your result will be wrong!" but hear me out.
3. You round for the first factor 'found', and from there, you take the result and do p/a to get b. If 'a' is actually a factor of p, then mod(b, 1) == 0, and then naturally, a*b SHOULD equal p.
If not, you throw out both numbers, rinse and repeat.
Now I knew this this could be faster. Realized the finer the representation, the less important the fractional digits further right in the number were, it was just a matter of how much precision I could AFFORD to lose and still get an accurate result for r*p=a.
Fast forward, lot of experimentation, was hitting a lot of worst case time complexities, where the most significant digits had a bunch of zeroes in front of them so starting at 1.0 was a no go in many situations. Started looking and realized
I didn't NEED the ratio of a/b, I just needed the ratio of a to p.
Intuitively it made sense, but starting at 1.0 was blowing up the calculation time, and this made it so much worse.
I realized if I could start at r=1/sqrt(p) instead, and that because of certain properties, the fractional result of this, r, would ALWAYS be 1. close to one of the factors fractional value of n/p, and 2. it looked like it was guaranteed that r=1/sqrt(p) would ALWAYS be less than at least one of the primes, putting a bound on worst case.
The final result in executable pseudo code (python lol) looks something like the above variables plus
while w >= 0.0:
if (p / round(w*p)) % 1 == 0:
x = round(w*p)
y = p / round(w*p)
if x*y == p:
print("factors found!")
print(x)
print(y)
break
w = w + i
Still working but if anyone sees obvious problems I'd LOVE to hear about it.38 -
DAMN IT JUST SEND ME SOME FLOWERS
Started a new job yesterday, and rather than making my partner work to pick up hints I have said explicitly a few times that I want him to send me flowers at work, because
1) Yay flowers!
2) Displays dominance over other women at work because it demonstrates I have a caring partner
3) Did I mention pretty flowers?
4) Let's the dudes at work know I'm in a relationship so that means we can all just focus on being colleagues
FFS I even sent a link to a site that does local same day delivery for no extra charge, and pointed out the three bouquet styles I like best. So easy.
But he has yet to send me any.
And as I'm filling out the W-4, learning that I have to pay an extra $10k in taxes, because we eloped a week ago and apparently that's what happens when two high earners file jointly and it's making me want to rant because THE COST OF FLOWERS IS INSIGNIFICANT TO MY TAX BURDEN SO SEND ME THE DAMN FLOWERS.
(and yes technically it's "our" tax burden and yes the money spent on a bouquet would only add to our shared house expenses but I don't care; I'm generally anti flower but there's a time and a place and this is the time and the place)
And if he sends them late in the week, a significant portion of their prime blooming time will be during the weekend which is just wasteful so ugh.
</rant>17 -
#define Minion (A junior from my college)
Minion : Hey, can you suggest me from some good project for my final year.
Me : Sure , which "programming language" do you know?
Minion : Well i am good at HTML.
Me(triggered);
Me : Ya sure , make a "program" using HTML only that takes input from a user and prints that nth prime number.
Minion : 😱😱😱😱5 -
My 2018 wish:
I wish Amazon and Google would end their childish fight so that i can finally stream Amazon Prime to my TV using Chromecast.4 -
*logs out of Google on Android*
*has this persistent Google search bar on launcher which I keep on accidentally tapping*
Alright, so I'm not logged into Google to see how it goes. Kind of an experiment to see just how intertwined Android and my life are with Google. And it's going quite well actually, except for my prime apps that I can't seem to get around.
*reads Google privacy policy*
"We protect your data by keeping it secure!"
Hmm, yeah.. you and 3 letter agencies are keeping it secure and out of the hands of other individuals.. that makes sense.
Don't be evil.. unless you're the devil, right?
Fuck you, I won't login like this.
*accidentally opens Google*
*le trending results show up*
- KSI vs Logan Paul weigh-in!
- KSI vs Logan Paul Manchester!
- KSI vs Logan Paul arena fight!
*opens up NewPipe in which I am not logged in either*
- KSI vs Logan Paul!!!
- Did you see the KSI vs Logan Paul stuff yet?!
*logs back into Google straight away*
Personalized search engine.. many hate it, but boy do I fucking love it.4 -
This has been said countless times before me, and way better than me that’s supper tired, but I need to rant out
And what I’m ranting out today, is Apple. Its essence, its core, the reason it still exists: the ECOSYSTEM!
The problem with Apple ecosystem is that it’s the ecosystem of a fucking PRISON!
People like it because it works well together , but it’s sure that in a prison, the path from your cell to the cantine is pretty optimized; you get forced there! And you might try to get your food elsewhere, but the walls of the prison are made to be difficult to cross. Especially on mobile, where they’re making it harder and harder to escape, to make a jailbreak (pun-intended). Keeping you the loyal little sheep, or the forcing you to it.
That prison is also made private, a little club, to attract people to it. They even got their own little system to talk to each other, but oh god protect them from their little messages to pass the walls of the prison.
And all that prison is guarded by the warden, watching from high in the cloud. Forcing you to report yourself to him to be part of that prison.
That prison, also, can only be entered with specific vehicles, provided by the prison, to ensure maximum compatibility and efficiency. Good luck entering with a disguised vehicle if you find the official ones too pricey for their parts.
They also provided pressure tubes to send things from one cell to another. While being only simple pressure tubes like any other, they’re acclaimed because they’re apparently easier to use than the other 3rd party pressure tubes that can send things to the outside. Why? Because, oh yes it’s already in everybody’s cells (of that prison, outside is dangerous) and the other tubes have been conveniently being placed somewhere harder to reach.
Another thing they have are those windows that can view the outside. While being maybe less clear than some other windows, they are ok. But if you ever consider going mobile to enjoy that safari with lions, then man do they love bringing you back to that window.
Ok so I’m done with the prison metaphor, or I won’t sleep.
The ecosystem is probably the major reason Apple is still there. You buy from there because you’re a prisoner (I guess I’m not finished with the metaphor after all).
This is a prime example of RMS’s quote “If the user doesn’t control the software, the software controls the user”
AirDrop isn’t some sort of revolutionary tech, it uses a well established protocol that other implementations use to do the same thing. They could really easily open source the protocol and allow everyone to profit, but they won’t, because that would mean you don’t have to buy Apple.
That’s why I militate for open source, decentralized and standardized protocols. Because that way, we control the software, and it doesn’t control us.
All the things I said aren’t so bad because when you buy Apple, you make a choice. But I don’t have a choice, I am typing this on an Apple device, because I need to (I won’t elaborate on that) because of that fucking *ecosystem*
I am really tired, so half the sentences probably don’t make sense, but thanks for coming to my stupid TED talk.12 -
Great !! Why would a tech giant like amazon work against linux ?
Amazon Prime music doesnt work with Linux/Firefox , but suddenly works when i switch user agent to Windows/Firefox . They are somehow purposefully blocking out linux ! Why ?? Whyyy ??7 -
> be me
> has some free time
> decides to practice rust skills
> logs on codewars
> finds challenge involving prime numbers
> passes 30 min skimming the Internet to implement the Sieve Of Atkin algorithm
> tries example tests
> passes
> submits answer
> “memory allocation of 18446744073709547402 bytes. failederror: process didn’t exit successfully”
> 18446744073709547402 bytes ~= 18 million petabytes
So yeah, I think it’s broken9 -
Amazon: you're logged into 53 devices.
Me: ooooh Kay, since when do I have that many devices. let's sign out of em all and change the password for some piece of mind.
Spongebob: * a few hours past *
Spam email: someone in the US has logged into your account - click here to verify through some random URL that doesn't even contain "Amazon" in it 🥳
-
I suddenly have that feeling Amazon sells you're account setting changes and not just your personal details.3 -
EEEEEEEEEEEE Some fAcking languages!! Actually barfs while using this trashdump!
The gist: new job, position required adv C# knowledge (like f yea, one of my fav languages), we are working with RPA (using software robots to automate stuff), and we are using some new robot still in beta phase, but robot has its own prog lang.
The problem:
- this language is kind of like ASM (i think so, I'm venting here, it's ASM OK), with syntax that burns your eyes
- no function return values, but I can live with that, at least they have some sort of functions
- emojies for identifiers (like php's $var, but they only aim for shitty features so you use a heart.. ♥var)
- only jump and jumpif for control flow
- no foopin variable scopes at all (if you run multiple scripts at the same time they even share variables *pukes*)
- weird alt characters everywhere. define strings with regular quotes? nah let's be [some mental illness] and use prime quotes (‴ U+2034), and like ⟦ ⟧ for array indexing, but only sometimes!
- super slow interpreter, ex a regular loop to count to 10 (using jumps because yea no actual loops) takes more than 20 seconds to execute, approx 700ms to run 1 code row.
- it supports c# snippets (defined with these stupid characters: ⊂ ⊃) and I guess that's the only c# I get to write with this job :^}
- on top of that, outdated documentation, because yea it's beta, but so crappin tedious with this trail n error to check how every feature works
The question: why in the living fartfaces yolk would you even make a new language when it's so easy nowadays to embed compilers!?! the robot is apparently made in c#, so it should be no funcking problem at all to add a damn lua compiler or something. having a tcp api would even be easier got dammit!!! And what in the world made our company think this robot was a plausible choice?! Did they do a full fubbing analysis of the different software robots out there and accidentally sorted by ease of use in reverse order?? 'cause that's the only explanation i can imagine
Frillin stupid shitpile of a language!!! AAAAAHHH
see the attached screenshot of production code we've developed at the company for reference.
Disclaimer: I do not stand responsible for any eventual headaches or gauged eyes caused by the named image.
(for those interested, the robot is G1ANT.Robot, https://beta.g1ant.com/)
4 -
[long]
When searching for internship via school I found this small startup with this cute project of building a teaching tool for programming. There were back then 2 programmers: the founder and the co-founder.
Then like 1 week before the internship started, the co-founder had a burnout and had to get off the project, while the company was so low on budget the founder, aka my new b0ss, had to work separate jobs to keep the company alive. (quite metal tbh)
It's funny because I'm a junior developer, 100%. I've been coding as a hobby for around 8 years now but I've never worked in a big company before. (No exception to this workplace either)
First project I get: rewrite the compiler. The Python compiler.
"But wait, why not just embed a real compiler from the first case?"
-nanananana it's never simple, as you probably know from your own projects.
The new compiler, as compared to existing embedded compiler solutions out there, needed these prime features:
- Walk through the code (debugger style), but programmatically.
- Show custom exceptions (ex: "A colon is needed at the end of an if-statement" instead of "Syntax error line 3")
- Have a "Did-you-mean this variable?" error for usage of unassigned variables.
- Be able to be embedded in Unity's WebGL build target
All for the use case of being a friendly compiler.
The last dash in the list is actually the biggest bottleneck which excluded all existing open-source projects (i could find). Compliant with WebAssembly I can't use threads among other things, IL2CPP has lots of restrictions, Unity has some as well...
Oh and it should of course be built using test-driven development.
"Good luck!" - said the founder, first day of work as she then traveled to USA for **3 weeks**, leaving me solo with the to-be-made codebase and humongous list of requirements.
---
I just finished the 6th week of internship, boss has been at "HQ" for 3 weeks now, and I just hit the biggest milestone yet for this project.
Yes I've been succeeding! This project has gone so well, and I'm surprising myself how much code I've been pumping out during these weeks.
I'm up now at almost 40'000 lines of source and 30'000 lines of code. ‼
( Biggest project I've ever worked on previously was at 8'000 lines of code )
The milestone (that I finished today) was for loops! As been trying to showcase in the GIF.
---
It's such a giant project and I can honestly say I've done some good work here. Self-five. Over-performing is a thing.
The things that makes me shiver though is that most that use this application will never know the intricates of it's insides, and the brain work put into it.
The project is probably over-engineered. A lot. Having a home-made compiler gives us a lot of flexibility for our product as we're trying to make more of a "pedagogic IDE". But no matter that I reinvented the wheel for the 105Gth time, it's still the most fun I've had with a project to date.
---
Also btw if anyone wants to see source code, please give me good reasons as I'm actively trying to convince my boss to make the compiler open-source.
Cheers!
4 -
MySQL has the absolute worst error messages.
"You have an error in your SQL syntax; check the manual that corresponds blah blah near '(some random code line)'".
How vague can you be? It doesn't help that I always find the error in a completely different place to where the message says it is.5 -
Highschool culture...
Here in Italy we run a few exam simulation in order to prepare for finals in June.
One of the two categories of simulations, one of which revolves around the core subjects of our technical course which in my case is CompSci and Networking.
"Sounds good!" one would say.
And I'd agree, if only our CompSci professor graded solutions in a sensate manner.
If one does not exactly copy and paste the solutions we repated in class 100 times (which, by the way, are all EXACTLY the same solution but with different data in diagrams and other sections), the grade WILL be insufficient: no but's or why's.
This is only one of the prime examples of what school revolves around. Sometimes it just feels like we are trained to be sheeps in a world of wolves. Rinse and repeat over and over. No technical competency is (almost) ever valued or allowed to be expressed and is often looked down upon by old school professors who literally care about everything but their subject, students and school in general.
I'm glad this is almost over, and that greener pastures are ahead :)8 -
Once I ordered a pack of highlighters for Amazon Prime Day and accidentally received a GTX 1080TI graphics card instead. Last year, I received a saw blade instead of some sunscreen. Any of you receive any "accidental treasure" from Amazon?17
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Some of y'all post some retarded quotes man no lie.
"A programmer does not fix computers" ~Some Indian dude
Really??!!
Does that need to be made into a quote? And do you honestly believe something soooo mundane should be attributed to one person only?
"Drink a glass of water every morning, best way to start your day" ~ Alecx(read with Indian accent even though I am Mexican American)
"Sleeping in your own bed is always the best" ~ Alecx
See how stupid that shit is? Quoting shit that is sooooo fucking generic and that literally anyone can think off?
I dunno why it pisses me off soooo fucking much. Ffs. The same thing about "dev jokes" do you have any idea how fucking cringey that shit is? And half the fucking time y'all post that shit in some of the most broken ass English I've ever seen man wtf.
The quality of rants has been going down in spirals and with a dogon YEEEE HAW and darling trust this motherfucker....I know a lil something about yeee haws.....this is a prime example.
Look, people can rant and post whatever the fuck they want. I ain't gonna hold you back on it. Just know that a lot of us think you are a moron.
A cringey moron at that.25 -
I just realised that I've been experiencing a lot of stress and frustration over the last couple of months. I also realised that these feelings of dread and existential anxiety stem from my heavy use of Ubuntu. So I ended another agonizing 3 hours of trying-to-get-internet-access-again-so-I-can-get-some-fucking-work-done and managed to blow off some steam without causing too much property damage. Then I sat down and thought about it. And you know what? I hate Ubuntu.
With Window$ I can at least get some work done without having to write my own network drivers because the current ones do not function when the day of month is a prime number or some shit.15 -
Fucking Amazon rant again...
TLDR: Amazon specializes in “the last mile”. They are repeatedly allowing a 3rd party shipper (Purolator) destroy their main value proposition. Thoughts at the end.
Me on the phone with their support...
Me: so it says my package was attempted to be delivered today. I did not get a call or notification or anything and I have been working from home all day to wait for the package.
Support: -Sigh- yes, I can see it was Purolator we have been having trouble with them lately.
Me: ok, so are you able to see what happened?
Support: let me put you on hold.
.......
Support: So they said they will not call for a delivery, did they use your building buzzer?
Me: Nope, just stood outside the building and then left I guess.
Support: -sigh- Well you can pick it up at their depot. Let me get you the address.
Me: The one by the airport?
Support: Yes it looks like it is about an hour away from where you are. And they are only open during work hours.
Me: So, after working from home to get this package you advice is to take 3 hours off work and go there to pick it up?
Support: Well, we can refund it? If thats what you want.
Me: No, I would like the package I ordered please.
Support: There is nothing I can do sir.
Me: So before I hang up let me see if I have it straight. When I order a package from Amazon, do I have an option of who ships it?
Support: No, I’m sorry but that is decided on our end.
Me: And I have had this problem before with this shipping agent. So, your telling me that when I ship things to me with Amazon that I have no control of wether I even get the package? Your telling me it is literally a coin toss as to wether or not I ever get my package?
Support: yes sir, I’m sorry but that is all I can do.
Me: So you realize that, for example, if I went to my local grocery store and it was a coin toss that I could take my groceries home (even after I paid for them) then I will always go to another store....
Support: yes, I know. There is nothing I can do.
Me: So from now on I have to order items, wait for them to be shipped, check the shipper and then cancel the order of it is them?
Support: -sigh- you cannot cancel an order after it has shipped...
Me: wow. Sure is great being a prime and audible member. I get fast delivery of 50% of my packages and no delivery at all of the other 50%. Sorry for the sarcasm...
Support: I’m sorry I can’t help more.
Me: So just to clarify. I can expect NOT to get the package I ordered?
Support: sorry
Me: have a nice day.
————
Here are my thoughts as a student of business...
Amazon specializes in “the last mile” (in their delivery service anyway) and when they deliver the package they also deliver on that value proposition.
However, now it seems that one of their shipping providers is failing at getting packages that last mile, which is resulting and destroying the idea of their value proposition in a customers eyes. (Affecting more than me as the rep said)
Now, instead of believing that Amazon will get things to me, saving me that last mile trip to the store etc., I firmly believe that it is a toss up as to wether I will ever receive my package (based on carrier)
I know that if I was in Amazon’s position (a carrier hurting my overall value proposition with consistently unacceptable service) that I would come down on them with a force they have never seen or drop them entirely.
But of course, every company reaches a point where they have such market share and sway that they take their eye off the ball when it comes to their value proposition to customers.16 -
Had a longer talk with a friend today.
Acquaintances of theirs were at a restaurant (!) a few days ago, complaining about how much they paid for breakfast buffet. Their rant went on how the restaurant didn't even include coffee in the breakfast buffet.
I know this restaurant. I really like it there. They roast their own coffee in the back. They have a transparent bakery with spelt flour, from certified organic farming. They support the regional farmers, even the meat for the cold cuts etc comes from a local butcher, livestock is from regional free range farming.
If you wanna know what's wrong with customers, that's the prime example.
Not only didn't they bother at all to look at the menu... They ignored at all what they paid for. Just stuffed themselves without any thought at all.
Then they wondered why the price was so high.
Of course, high price = bad, so they rant everywhere what a bad restaurant they visited.
It just made me so fucking angry, cause that's the same shit I have to deal every day with. Not giving a damn, not reading any information at all - but spouting nonsense and foul mouthing everything is okay.
Fuck those kinds of humans.1 -
"The laws of mathematics are very commendable but the only law that applies in Australia is the law of Australia", said Australian Prime Minister Malcolm Turnbull today.
Now what the fuck is this? Why would you propose a blanket ban on end-to-end encryption or force companies to build "secure" backdoors? At this rate retarded politicians would make our lives too difficult.
https://eff.org/deeplinks/2017/...3 -
I wrote an app (took all morning until now) that tells me which shows and movies Amazon removed from Prime...
I forget why I wanted this... was it just to screw with Amazon because they rejected me....
The app is also going to tell me what movies/shows were added because they can't fucking sort them in chronological order by release date. I don't want movies from pre-1990s that were recently added...
Yes I could search for them manually but it's too fuckin tedious, gotta turn on like 10 filtering options...
And maybe I just want to run mini-DDOS attacks on their servers...
13 -
A lot of talk about PMs here. I wasn't aware of how many developers have to report directly to prime ministers.1
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Teaching my homeschooled son about prime numbers, which of course means we need to also teach prime number determination in Python (his coding language of choice), when leads to a discussion of processing power, and a newly rented cloud server over at digital ocean, and a search of prime number search optimizations, questioning if python is the right language, more performance optimizations, crap, the metrics I added are slowing this down, so feature flags to toggle off the metrics, crap, I actually have a real job I need to get back to. Oooh, I'm up to prime numbers in two millions, and , oh, I really should run that ssh session in screen so it keeps running if I close my laptop. I could make this a service and let it run in the background. I bet there's a library for this. He's only 9. We've already talked about encryption and the need to find large prime numbers.3
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Inspired by this post
https://devrant.com/rants/2217978/...
I challenged myself to use SQL to get the prime numbers under 100,000
8 -
Two big moments today:
1. Holy hell, how did I ever get on without a proper debugger? Was debugging some old code by eye (following along and keeping track mentally, of what the variables should be and what each step did). That didn't work because the code isn't intuitive. Tried the print() method, old reliable as it were. Kinda worked but didn't give me enough fine-grain control.
Bit the bullet and installed Wing IDE for python. And bam, it hit me. How did I ever live without step-through, and breakpoints before now?
2. Remember that non-sieve prime generator I wrote a while back? (well maybe some of you do). The one that generated quasi lucas carmichael (QLC) numbers? Well thats what I managed to debug. I figured out why it wasn't working. Last time I released it, I included two core methods, genprimes() and nextPrime(). The first generates a list of primes accurately, up to some n, and only needs a small handful of QLC numbers filtered out after the fact (because the set of primes generated and the set of QLC numbers overlap. Well I think they call it an embedding, as in QLC is included in the series generated by genprimes, but not the converse, but I digress).
nextPrime() was supposed to take any arbitrary n above zero, and accurately return the nearest prime number above the argument. But for some reason when it started, it would return 2,3,5,6...but genprimes() would work fine for some reason.
So genprimes loops over an index, i, and tests it for primality. It begins by entering the loop, and doing "result = gffi(i)".
This calls into something a function that runs four tests on the argument passed to it. I won't go into detail here about what those are because I don't even remember how I came up with them (I'll make a separate post when the code is fully fixed).
If the number fails any of these tests then gffi would just return the value of i that was passed to it, unaltered. Otherwise, if it did pass all of them, it would return i+1.
And once back in genPrimes() we would check if the variable 'result' was greater than the loop index. And if it was, then it was either prime (comparatively plentiful) or a QLC number (comparatively rare)--these two types and no others.
nextPrime() was only taking n, and didn't have this index to compare to, so the prior steps in genprimes were acting as a filter that nextPrime() didn't have, while internally gffi() was returning not only primes, and QLCs, but also plenty of composite numbers.
Now *why* that last step in genPrimes() was filtering out all the composites, idk.
But now that I understand whats going on I can fix it and hypothetically it should be possible to enter a positive n of any size, and without additional primality checks (such as is done with sieves, where you have to check off multiples of n), get the nearest prime numbers. Of course I'm not familiar enough with prime number generation to know if thats an achievement or worthwhile mentioning, so if anyone *is* familiar, and how something like that holds up compared to other linear generators (O(n)?), I'd be interested to hear about it.
I also am working on filtering out the intersection of the sets (QLC numbers), which I'm pretty sure I figured out how to incorporate into the prime generator itself.
I also think it may be possible to generator primes even faster, using the carmichael numbers or related set--or even derive a function that maps one set of upper-and-lower bounds around a semiprime, and map those same bounds to carmichael numbers that act as the upper and lower bound numbers on the factors of a semiprime.
Meanwhile I'm also looking into testing the prime generator on a larger set of numbers (to make sure it doesn't fail at large values of n) and so I'm looking for more computing power if anyone has it on hand, or is willing to test it at sufficiently large bit lengths (512, 1024, etc).
Lastly, the earlier work I posted (linked below), I realized could be applied with ECM to greatly reduce the smallest factor of a large number.
If ECM, being one of the best methods available, only handles 50-60 digit numbers, & your factors are 70+ digits, then being able to transform your semiprime product into another product tree thats non-semiprime, with factors that ARE in range of ECM, and which *does* contain either of the original factors, means products that *were not* formally factorable by ECM, *could* be now.
That wouldn't have been possible though withput enormous help from many others such as hitko who took the time to explain the solution was a form of modular exponentiation, Fast-Nop who contributed on other threads, Voxera who did as well, and support from Scor in particular, and many others.
Thank you all. And more to come.
Links mentioned (because DR wouldn't accept them as they were):
https://pastebin.com/MWechZj912 -
I've had my stickers for months now, and I finally have the perfect place for them. Amazon prime day convinced me I needed a beer fridge in my office...
1 -
We've all had shitty jobs at one point or another, maybe some of us already had software engineering experience while having to work in a different field for a variety of reasons.
Well check this shit.
At one point(during my second year of school) for various reasons I had to work in retail. For those that know, retail can be a soul crushing experience...the trick is not letting management to convince you that it is an actual good job, it is not, and I have respect and sympathy for everyone currently working in it. The mind numbing retarded customers that we get are absolutely fantastic in every sense of the word.
My position in retail was as a phone salesman, for MetroPCS (which for all of y'all european ninjas is one of the low end phone carriers here in the U.S) and the people that we get as customers where I live are normally very poor which apparently in Mexican culture stands for annoyingly ignorant (I am Mexican myself, so I can really vouch for this shit)
One day a customer came in telling me that there was an app that he was using that kept giving him troubles, it was a map application for truck drivers. Now, obviously, this had nothing to do with my line of work(phone salesman) and as such I normally tried to explain that and let them be, but I imagined that it was a settings issue so I reluctantly agreed to help him. I explained to him that the app was no longer maintained and that the reason for it was probably that the developer abandoned it and that he would just have to look into the app, upon closer inspection the app itself was nothing more than a wrapper over google maps with trucker icons and a "trucker" interface, he was using the app as a GPS navigator and he could as well just have been using google maps.
The conversation was like this:
Me: Well this app is no longer supported, it will probably be taken off the google store soon, you can look for something similar or just change to Google maps
Retard: What? no! I came here in order for you to fix it, Metro needs to fix their own apps!
Me (in complete disbelief): We have no control over third party apps, and even for the ones that we provide the store has no control over them. But this app is not ours and so we can't really do anything about it.
Retard: Well WTF should I do? I have been having many issues with youtube and spotify, shouldn't Metro fix their Google store?
Me: Those apps are not ours.....wait, you seem to believe that we own youtube and spotify, those are not ours
Retard: How the fuck they are not yours! its your phone isn't it?
Me: Eh no.....Metro does not(at this point I was sort of smiling because I wanted to laugh) own youtube or spotify or the play store or even this phone, metro does not own Android or Samsung(his phone was a samsung core prime)
Retard: Well You need to fix this
Me: No I do not and I can not, the developer for this app abandoned it and has nothing to do with us
Retard: Well call the developer and tell him to fix it
At this point I was on a very bad mode since this dude was being obnoxiously rude from the beginning and it annoyed me how he was asking for dumb shit.
Me: Did you pay for this app?
Retard: No
Me: So you expect that some developer out there will just go about and get working for something that you did not pay for?
Why don't you just use Google maps as your GPS?
Retard: Don't be stupid, Google has no maps
At this point I show him the screen where there is a lil app that said maps, pressed it and voila! map comes to life
Retard: Well....I did not know
Me: Yeah....but I am the stupid one right?
** throws phone for him to catch
Me: Have a good one bud.
And my manager was right next to me, he was just trying to control his laughter the whole time. I really despised working in there and was glad when I left. Retail man.......such a horrible fucking world.7 -
I tried to compare Python and Julia by letting them calculate the first 200000000 prime numbers. The result is dumbfounding.
Python: 95.91282963752747 seconds
Julia: 3.84788227110 -
Cisco.
It’s a prime example of “Don’t get attached to the company just because of one thing.” I have three of their routers that I bought used. WRT160N, WRT310N, and WRT610N. They all looked aesthetically pleasing and I thought all would be fine and dandy. Until I got a internet boost. Going from 12/1.5 up/down to 250/25 up/down.
HOWEVER, MY ROUTERS CANNOT REACH EVEN HALF THE SPEED DOWN.
Best part was when I called, they said that they couldn’t fix it because of one thing that all the routers have in common.
Legacy.
I’ve tried dd-wrt all with no luck. And they have the audacity to recommend another product of theirs?!?17 -
you wanna know what the most hilarious shit is? hackernews users AKA the 6 figure startup bros that "rule the world" in terms of code and software...
trying to argue the best way to build a website 😂😂😂😂😂😂😂😂😂
here's some select quotes:
"I believe the most minimalistic and productive way is to just use php"
^ this guy must not know its 2023 now
"Unless you are a web developer I don't see the point of a CSS framework, it's much easier to roll your own."
^ this guy must not know the pain and suffering that is 'rolling your own' in CSS
"Sadly, I just don't have the time to generate the content I wanted to do, so the site sits."
^ this guy just... wait, what?
but you know what? these guys clearly know WAY more than me in terms of software, it's good they get infinite salad bar and prime rib every day at silicon valley's best and brightest!
please fucking kill me i want it to end16 -
It's amazing how bold some services are, not only do you pay for their service, e.g. amazon prime, but you also watch fucking ads before you get to watch what you pay for12
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For fucks sake, Amazon Prime has also decided that they are adding ads to their *paid subscription*. Because I guess paying them fucking monthly is not enough for them greedy fucks. It's not like they were loosing money either, the service had a slow but exponential growth ever since 2014 (slow in the sense that it was only hundreds of millions at first, but luckily it was tens of billions by 2022, poor amazon eh?) ... first fucking Netflix does this, and now these retarded fucks follow suit like little retarded ducklings with dollar signs for eyes. You can bet your fucking hats that the other services will jump on the adWagon soon too...
"you will own nothing and be happy".. yeah fuck you, you fucks. As if owning nothing wasn't bad enough, now that nothing comes with fucking ads on top FOR THE SAME FUCKING PRICE?!... And they have the audacity to fucking ask for *more* monthly money to get rid of the ads they oh so graciously provided?!
I don't even use fucking amazon prime, but what the actual fuck. This is *one* of the reasons I canceled my netflix sub. I'm not going to fucking support this behavior even if it doesn't affect me. But I guess some people keep showing netflix dicks into their gaping asses because they sure don't seem to be taking this bullshit back... And I assume even more people will keep sucking amazon dicks as if this was a-ok behavior.
god, shit like this really makes me angry...3 -
I think this will be a prime year for machine learning. In 2016, there were too many factors at play, like 72, 144, and 42 just to name a few.1
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I didn't leave, I just got busy working 60 hour weeks in between studying.
I found a new method called matrix decomposition (not the known method of the same name).
Premise is that you break a semiprime down into its component numbers and magnitudes, lets say 697 for example. It becomes 600, 90, and 7.
Then you break each of those down into their prime factorizations (with exponents).
So you get something like
>>> decon(697)
offset: 3, exp: [[Decimal('2'), Decimal('3')], [Decimal('3'), Decimal('1')], [Decimal('5'), Decimal('2')]]
offset: 2, exp: [[Decimal('2'), Decimal('1')], [Decimal('3'), Decimal('2')], [Decimal('5'), Decimal('1')]]
offset: 1, exp: [[Decimal('7'), Decimal('1')]]
And it turns out that in larger numbers there are distinct patterns that act as maps at each offset (or magnitude) of the product, mapping to the respective magnitudes and digits of the factors.
For example I can pretty reliably predict from a product, where the '8's are in its factors.
Apparently theres a whole host of rules like this.
So what I've done is gone an started writing an interpreter with some pseudo-assembly I defined. This has been ongoing for maybe a month, and I've had very little time to work on it in between at my job (which I'm about to be late for here if I don't start getting ready, lol).
Anyway, long and the short of it, the plan is to generate a large data set of primes and their products, and then write a rules engine to generate sets of my custom assembly language, and then fitness test and validate them, winnowing what doesn't work.
The end product should be a function that lets me map from the digits of a product to all the digits of its factors.
It technically already works, like I've printed out a ton of products and eyeballed patterns to derive custom rules, its just not the complete set yet. And instead of spending months or years doing that I'm just gonna finish the system to automatically derive them for me. The rules I found so far have tested out successfully every time, and whether or not the engine finds those will be the test case for if the broader system is viable, but everything looks legit.
I wouldn't have persued this except when I realized the production of semiprimes *must* be non-eularian (long story), it occured to me that there must be rich internal representations mapping products to factors, that we were simply missing.
I'll go into more details in a later post, maybe not today, because I'm working till close tonight (won't be back till 3 am), but after 4 1/2 years the work is bearing fruit.
Also, its good to see you all again. I fucking missed you guys.9 -
Half a year ago, I got fired in my job. The reason was the same always bullshit; we have very little clients, economy nowadays is terribly bad, our priorities are different now than when we hired you, etc.
The last week I spent there, I heard something about my poor performance and programming skills, and that pissed me off a lot. For six months I worked on a laravel web app for managing customers, tasks and invoices, a fucking CRM, but made specifically for that company just because they didn't know sugar, odoo, prime or whatever.
Parallel to the crappy CRM, I was told to patch some PrestaShop, WordPress and plain sites, and it was hard to communicate with customers, management ignored every email I sent, and all I was told to do was "do as they say".
The result was shit, obviously, and my work showed much less skill, knowledge and expertise than I really have.
After that, I spent a few months unemployed, studying and working as a waiter just to survive, because my contract didn't comply with unemployment office requirements for a pay.
Then I got this job, on an analytics company where guess what, I'm told to write a fucking laravel web app for managing customers, invoices and tasks. In the meantime, I design websites, and communication with customers is shit, and management ignores every single mail I send.
My salary is eight hundred putos euros again, and will contract is wet shit.
I know, maybe I am "not that good" to earn a 3000€+ salary and have a good team support.
But I'm not */that/* bad.5 -
A couple of weeks ago I went to an interview where I was asked the following questions back to back: "What would you do if you were the prime minister?" && "What would you do if you were the attorney general of the United Nations".
Needless to say, I wasn't prepared for that...5 -
Julia is a smelly pile of steaming shit.
https://discourse.julialang.org/t/...
Jesus fucking christ would you look at that pile of pure utter shit. The dumbfuck dev somehow managed to break WHILE loops for devs coming from python, and I speak for myself and probably others when I write most of us python developers are functionally braindead. If you can somehow fuck it up for python devs, a significant portion of the people you're trying to attract (owing by the syntax), then you should probably just go head and delete your whole git repo now.
Julia is a prime example of why you don't listen to your users on fucking github about the direction of language development.
What a bunch of fucking booger eating retards.33 -
Zero Days documentary about stuxnet malware features a "identity protected" NSA employee who reveals information about classified NSA tactics.
She claims "I would NEVER compromise ongoing operations in the field."
Well it's too bad that Amazon Prime Video and IMDB don't share your values. They have compromised your name, Joanne Tucker, and the other films you were in.
Nice acting though. You really have people believing you were a real source!
15 -
TL:DR; DON'T GET INTEL+NVIDIA LAPTOP FOR LINUX.
In the same vain as Linus Torvalds: "Fuck Nvidia, and Intel".
Trying to get intel+nvidia laptop prime w/e working is a living hell.
I'm running Manjaro(arch for lazy people) with I3-gaps(larbs).
So Manjaro provides this handy script/program mhwd that supposedly would enable the non free blob Nvidia driver except it doesn't work cause it uses bumblebee and it's saying it can't find the clearly installed fucking Nvidia driver.
Bashing my head against a wall is more fucking productive then getting my cum stain of laptop to work properly.
"Just disable the intel graphics in bios"
I would except my old shitty Acer bios piece of fucking crap can't even after booting Windows for usb hdd and flashing BIOS.
GUESS WHAT LINUX COMMUNITY THAT'S WHY NOBODY WANTS TO FREAKING USE LINUX FOR GAMING.
I fucking love Linux but I gave up gaming for it.
I'll start joining red team from now on instead of trying to use your broken shit.19 -
So part of my job is to watch movies.
Unreleased movies. Premier special movies. Restricted access movies. Special screening movies.
Fun part about being in a media tech company is you get amazing perks.
One of the product verticals we have, competes with Netflix and Amazon Prime Video.
So, we have to determine which movies to license and resell on our platform.
For which we have volunteer program where they assign us movies to watch. A couple of movies everyday. Folks have to submit their feedback on certain parameters and then the team evaluates and makes the decision.
As of last few weeks, Cannes 2022 was on and we had a lot of movies lined up. Got to watch some real good ones while some were mediocre.
Surely fun, don't get paid for it. Good perks. Loving it so far.10 -
CONTEST - Win big $$$ straight from Wisecrack!
For all those who participated in my original "cracking prime factorization" thread (and several I decided to add just because), I'm offering a whopping $5 to anyone who posts a 64 bit *product* of two primes, which I cant factor. Partly this is a thank you for putting up with me.
FIVE WHOLE DOLLARS! In 1909 money thats $124 dollars! Imagine how many horse and buggy rides you could buy with that back then! Or blowjobs!
Probably not a lot!
But still.
So the contest rules are simple:
Go to
https://asecuritysite.com/encryptio...
Enter 32 for the number of bits per prime, and generate a 64 bit product.
Post it here to enter the contest.
Products must be 64 bits, and the result of just *two* prime numbers. Smaller or larger bit lengths for products won't be accepted at this time.
I'm expecting a few entries on this. Entries will generally be processed in the order of submission, but I reserve the right to wave this rule.
After an entry is accepted, I'll post "challenge accepted. Factoring now."
And from that point on I have no more than 5 hours to factor the number, (but results usually arrive in 30-60 minutes).
If I fail to factor your product in the specified time (from the moment I indicate I've begun factoring), congratulations, you just won $5.
Payment will be made via venmo or other method at my discretion.
One entry per user. Participants from the original thread only, as well as those explicitly mentioned.
Limitations: Factoring shall be be done
1. without *any* table lookup of primes or equivalent measures, 2. using anything greater than an i3, 3. without the aid of a gpu, 4. without multithreading. 5. without the use of more than one machine.
FINALLY:
To claim your prize, post the original factors of your product here, after the deadline has passed.
And then I'll arrange payment of the prize.
You MUST post the factors of your product after the deadline, to confirm your product and claim your prize.99 -
Still on the primenumbers bender.
Had this idea that if there were subtle correlations between a sufficiently large set of identities and the digits of a prime number, the best way to find it would be to automate the search.
And thats just what I did.
I started with trace matrices.
I actually didn't expect much of it. I was hoping I'd at least get lucky with a few chance coincidences.
My first tests failed miserably. Eight percent here, 10% there. "I might as well just pick a number out of a hat!" I thought.
I scaled it way back and asked if it was possible to predict *just* the first digit of either of the prime factors.
That also failed. Prediction rates were low still. Like 0.08-0.15.
So I automated *that*.
After a couple days of on-and-off again semi-automated searching I stumbled on it.
[1144, 827, 326, 1184, -1, -1, -1, -1]
That little sequence is a series of identities representing different values derived from a randomly generated product.
Each slots into a trace matrice. The results of which predict the first digit of one of our factors, with a 83.2% accuracy even after 10k runs, and rising higher with the number of trials.
It's not much, but I was kind of proud of it.
I'm pushing for finding 90%+ now.
Some improvements include using a different sort of operation to generate results. Or logging all results and finding the digit within each result thats *most* likely to predict our targets, across all results. (right now I just take the digit in the ones column, which works but is an arbitrary decision on my part).
Theres also the fact that it's trivial to correctly guess the digit 25% of the time, simply by guessing 1, 3, 7, or 9, because all primes, except for 2, end in one of these four.
I have also yet to find a trace with a specific bias for predicting either the smaller of two unique factors *or* the larger. But I haven't really looked for one either.
I still need to write a generate that takes specific traces, and lets me mutate some of the values, to push them towards certain 'fitness' levels.
This would be useful not just for very high predictions, but to find traces with very *low* predictions.
Why? Because it would actually allow for the *elimination* of possible digits, much like sudoku, from a given place value in a predicted factor.
I don't know if any of this will even end up working past the first digit. But splitting the odds, between the two unique factors of a prime product, and getting 40+% chance of guessing correctly, isn't too bad I think for a total amateur.
Far cry from a couple years ago claiming I broke prime factorization. People still haven't forgiven me for that, lol.6 -
something kinda depressing about devrant is that, because of sexist bs, women have prime rant material, but this app is also full of sexist bs, so it ends up being kinda hostile towards a significant portion of the users257
-
Well, today was a fun day playing with Qubes OS. I really did nothing really difficult, I created a template for multimedia pruposes (Netflix, Amazon Prime, Spotify and VLC) based on debian and then create a domain based on that same template.
It works
Still need to fix the screen tearing, but it is nothing really serious, in fact I probably just change the graphic card to the integrated on the motherboard to see if something change.
Probably the next issue will be set a few domains for specific issues:
- Dev [personal]: This will be used for my personal projects.
- Dev [non personal]: For those times I collab with someone / not my stuff
- [√] Work: mail, msTeams, whatever from my job.
- Bank Stuff: I can asure you that
- [√] Multimedia: chill n stuff
and thats all for now.
PD: Ctrl + C, Ctrl + V Will be a nightmare xD6 -
While testing the newly discovered "primesieve" C library, I forgot to change the limit variable from 1e10 to just 10 when giving the value through pow to make it more explicit.
Now my PC is dying in front of me while trying to compute the Gogol nth prime number. Nice.3 -
So I decided to help my Mom's Mom setup an Amazon Fire TV. Now I've been here for about 3 - 4 hours and I'm setting up 2 Fire Tv's, A Router, Writting down passwords, setting up an Amazon account with Prime and fixing her computer.. 😤😢3
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!rant
So I was experimenting with distributing load on separate processes in node.js. I wrote the simplest isPrime function for performance testing, and I calculated a lot of primes. To be able to see the result, I generated a 1920x1080 image where each white pixel represents a prime.
New wallpaper?
5 -
Amazon's CEO Jeff Bezos becomes the first person ever worth $200 billion.
Thanks to my prime membership , else he'd still be at $199.999999999999 billion -
Why Netflix?? What's your problem if I have a private browsing habit? Your friend Amazon Prime doesn't complain about it!!
7 -
Google, will you ever manage to fix YouTube so it actually doesn't fucking break every day?
This "feature" where the page doesn't reload when I click reload is neat until I want to, you know, reload to see new content. Or reload because you failed to load a single video thumbnail. But no, you managed to combine the shit of both worlds and give me a loading progress bar and then don't change anything.
Also YouTube is the prime example why you don't try to reinvent text input fields. I can't remember a single instance in the last 5 years where the comment fields didn't have at least one weird bug.
Why do tech companies build the shittiest websites?10 -
Really regretted to born in India. I know I should not say bad about the country in which I born and living it but there are so many reasons.
Govt of India is very poor. Nothing can be processed if you don't have offered bribe or you don't have political power and pressure.
My company offering me onsite to go London for my project, govt is not issuing me PCC Police Clearance Certificate even I never had any crime.
Police says for your current address 6 month is duration you're living here so we submitted 6 months crime is nil and 4.5 years is more required.
I went to passport office and happy to submit all documentation for previous addresses so that police verification can be done but no body is taking documents
No progress in my file.
I'm too much frustrated now.
I reported to ministry and prime minister of India but even no progress.
I'm really fed-up.
:(14 -
Amazon showed me this when I tried to cancel my prime trial
For a horrible second I thought I had to send it in by mail
1 -
I'm freaking done trying to get Linux on my machine. I've tried every distro with many different versions of the kernel and I always run into the same problem on my desktop.
The computer super stutters for 2 seconds ish than freezes.
I've spent DAYS looking into this issue trying to find something. The worst part is that it can happen 5 minutes when I boot or 5 hours. At first I thought it was Compton. Then I thought I installed arch wrong. Maybe an update to the BIOS? How about downloading updated microcode? Maybe this obscure bug with AMD processors and setting power idle to typical? Nothing. I'm now behind on my school work because of the massive amount of time ive spent getting this fixed. It works just fine on my laptop, but it doesn't work on the machine I built to code with. I'm done. Give me Force Lightning, a red lightsaber, and call me a Sith baby because I'm joining the dark side. Here I come Windows.
For those who are wondering my setup:
Ryzen 7 1700
Rx 480
Asus x-370 prime
16 gb Corsair RAM
And no, Windows has never had this bug.31 -
My grandmother recently died and me and my brother were wondering what was to happen to her 10+ year PC (Dell optiplex 760). I could find a use for the monitor and my brother wanted to use it as a server. We asked around at the family and everyone seemed ok with that except for one guy..
Apparently the PC is still in "prime condition" running Windows 7 after an upgrade from Vista. It has 'a graphics chip or something like that' and is better than any laptop on the market right now. (I actually had my HP zBook 15 g3 with me). He claimed it wasn't some old worthless piece of junk and most family members would probably be interested in this machine.
I didn't try to argue because I realized he was not at all knowledgeable about technology and I didn't want to be disrespectful.3 -
I think I did it. I did the thing I set out to do.
let p = a semiprime of simple factors ab.
let f equal the product of b and i=2...a inclusive, where i is all natural numbers from 2 to a.
let s equal some set of prime factors that are b-smooth up to and including some factor n, with no gaps in the set.
m is a the largest primorial such that f%m == 0, where
the factors of s form the base of a series of powers as part of a product x
1. where (x*p) = f
2. and (x*p)%f == a
if statement 2 is untrue, there still exists an algorithm that
3. trivially derives the exponents of s for f, where the sum of those exponents are less than a.
4. trivially generates f from p without knowing a and b.
For those who have followed what I've been trying to do for so long, and understand the math,
then you know this appears to be it.
I'm just writing and finishing the scripts for it now.
Thank god. It's just in time. Maybe we can prevent the nuclear apocalypse with the crash this will cause if it works.2 -
Found a clever little algorithm for computing the product of all primes between n-m without recomputing them.
We'll start with the product of all primes up to some n.
so [2, 2*3, 2*3*5, 2*3*5*,7..] etc
prods = []
i = 0
total = 1
while i < 100:
....total = total*primes[i]
....prods.append(total)
....i = i + 1
Terrible variable names, can't be arsed at the moment.
The result is a list with the values
2, 6, 30, 210, 2310, 30030, etc.
Now assume you have two factors,with indexes i, and j, where j>i
You can calculate the gap between the two corresponding primes easily.
A gap is defined at the product of all primes that fall between the prime indexes i and j.
To calculate the gap between any two primes, merely look up their index, and then do..
prods[j-1]/prods[i]
That is the product of all primes between the J'th prime and the I'th prime
To get the product of all primes *under* i, you can simply look it up like so:
prods[i-1]
Incidentally, finding a number n that is equivalent to (prods[j+i]/prods[j-i]) for any *possible* value of j and i (regardless of whether you precomputed n from the list generator for prods, or simply iterated n=n+1 fashion), is equivalent to finding an algorithm for generating all prime numbers under n.
Hypothetically you could pick a number N out of a hat, thats a thousand digits long, and it happens to be the product of all primes underneath it.
You could then start generating primes by doing
i = 3
while i < N:
....if (N/k)%1 == 0:
........factors.append(N/k)
....i=i+1
The only caveat is that there should be more false solutions as real ones. In otherwords theres no telling if you found a solution N corresponding to some value of (prods[j+i]/prods[j-i]) without testing the primality of *all* values of k under N.13 -
Part 2... I just bought Amazon Prime (with the free shipping)... spent all night watching a movie and then adding Recommendations too my Watchlist.
I think I added at least 10 movies and 30+ seasons...
Productivity --
Expenses/Purchases++2 -
When is prime videos going to fix it's search engine....
Not a single one of the 22 results found for "Harry Potter 5th part" was even close to Harry Potter :)13 -
I am watching Amazon prime Mr. robot and WTF hacking is so easy you just need to be alone and yeah morphine :P9
-
So, this is 2023, a year with a prime number, Windows updates will be fast, the Linux desktop will have a breakthrough, and AMD will have 25% dGPU market share.5
-
Officially faster bruteforcing:
https://pastebin.com/uBFwkwTj
Provided toy values for others to try. Haven't tested if it works with cryptographic secure prime pairs (gcf(p, q) == 1)
It's a 50% reduction in time to bruteforce a semiprime. But I also have some inroads to a/30.
It's not "broke prime factorization for good!" levels of fast, but its still pretty nifty.
Could use decimal support with higher precision so I don't cause massive overflows on larger numbers, but this is just a demonstration after all.13 -
wk48 best question:
My go to question for dev interviews is how do you find all prime numbers from 2 to x because there's so much room for optimisation.
Start with the basics, loop over every number and check if it's divisible by any number less than it, then record the prime numbers and check only those, then move to something like the sieve of eratosthenes then reduce the problem space and only iterate through 2 to sqrt(x)5 -
Oh, crikey: Windows 10 "Inaccessible boot device". Good old "bootrec /fixboot" didn't work, and any claims that "automatic repair" does anything useful is apparently bollocks.
So for the first time ever, I had to use a restore point to revert the system to where it was before Xamarin was installed. The prime suspect for this cock-up is Intel HAXM, since I don't belive anything else in Xamarin possesses the power to accomplish a boot loop.
-
I cancelled prime a few months ago so when I was doing BF shopping on Amazon yesterday, delivery is now 1wk instead of 2-days.
And shipping apparently is $9 if you don't meet the $25 minimum and manually select free shipping; I remember it was $6 before...
So a few thoughts I had:
1. Amazon really must need the Prime memberships to cover all the shipping costs since it is now a pain in the ass to get free shipping on the checkout page.
2. Americans really want instant gratification? Waiting a week is that painful?
In contrast, stuff from China take about a month but are much cheaper
3. The only thing that's worth buying via Amazon now is electronics and stuff that are fragile... And food that's on sale because they have to uphold quality
4. Lucky for me, I get 1 week shipping, I have more time to cancel orders... Which is what I actually did10 -
My phone just died. Got a new phone on recommendation of friends and flash Jolla on it. The OS is super nice but the "Android support" doesnt work. No lastpass, no netflix, no prime, signal works half, no banking app.
I really need my windows phone back. It just worked without issues. After two android phones and now a Jolla in about two years im kinda done with all this shit.14 -
Argh! (I feel like I start a fair amount of my rants with a shout of fustration)
Tl;Dr How long do we need to wait for a new version of xorg!?
I've recently discovered that Nvidia driver 435.17 (for Linux of course) supports PRIME GPU offloading, which -for the unfamiliar- is where you're able render only specific things on a laptops discreet GPU (vs. all or nothing). This makes it significantly easier (and power efficient) to use the GPU in practice.
There used to be something called bumblebee (which was actually more power efficient), but it became so slow that one could actually get better performance out of Intel's integrated GPU than that of the Nvidia GPU.
This feature is also already included in the nouveau graphics driver, but (at least to my understanding) it doesn't have very good (or none) support for Turing GPUs, so here I am.
Now, being very excited for this feature, I wanted to use it. I have Arch, so I installed the nvidia-beta drivers, and compiled xorg-server from master, because there are certain commits that are necessary to make use of this feature.
But after following the Nvidia instructions, it doesn't work. Oops I realize, xrog probably didn't pick up the Nvidia card, let's restart xorg. and boom! Xorg doesn't boot, because obviously the modesetting driver isn't meant for the Nvidia card it's meant for the Intel one, but xorg is to stupid for that...
So here I am back to using optimus-manager and the ordinary versions of Nvidia and xorg because of some crap...
If you have some (good idea) of what to do to make it work, I'm welcome to hear it.6 -
Why do recruiters always say "Would you like to hear more?" Aside from pissing people off with vague requests, you're missing prime Starship Troopers references, which is infinitely worse!
3 -
Mornings. Not just the run of the mill “I’m not a morning person” but I legitimately would be more productive if I could work night shift. It’s easier to think at night, and easier to sleep during the day. Not just a night owl, but it’s hard to breathe laying down at night sometimes. Sometimes I randomly can’t sleep. I’ve never had this trouble during the day during the occasions I get to sleep for long periods during the day. The morning is prime sleeping time IMO. Not wanting to wake up is one reason, but the changing weather helps and it just feels right.
I also don’t feel awake til the afternoon usually. Even if I get enough sleep and coffee. Code churns slow in the a.m.
I dream of night time being work time with long, restful naps durning the day. I feel more creative at night, and it’s easier to focus. There’s less thought of “oh it’s a nice day I should do x”
Just sucks that it’s not largely accepted and there’s not enough other night hawks to hang out with on my off days. And my work won’t let me do such a schedule. Everyone is an insufferable morning person.
Early to bed early to rise is a load of shit. We should be allowed to sleep at times it makes us happy.3 -
I got pranked. I got pranked good.
My prof at my uni had given us an asigment to do in java for a class.
Easy peasy for me, it was only a formality...
First task was normal but...
The second one included making a random number csv gen with the lenght of at least 10 digits, a class for checking which numbers are a prime or not and a class that will check numbers from that cvs and create a new cvs with only primes in it. I have created the code and only when my fans have taken off like a jet i realised... I fucked up...
In that moment i realised that prime checking might... take a while..
There was a third task but i didnt do it for obvious reasons. He wanted us to download a test set of few text files and make a csv with freq of every word in that test set. The problem was... The test set was a set of 200 literature books...17 -
Following on from my previous SQL script to find prime numbers
https://devrant.com/rants/2218452/...
I wondered whether there was a way to improve it by only checking for prime factors. It feels really dirty to use a WHILE loop in SQL, but I couldn't think of another way to incrementally use the already found prime numbers when checking for prime factors.
It's fast though, 2 mins 15 seconds for primes under 1,000,000 - previous query took over an hour and a half.
5 -
A little background on project fubar:
Project fubar was started a couple of years ago, by an entirely different set of devs, against an entirely different set of requirements which were never made transparent to this day, on a new platform and framework.
That means it had APIs either outdated or deprecated, front-end logic that did things it wasn't supposed to be doing and lots of scope creep and technical debt.
I had to support and fix fubar for the last few months to prime it for UAT. It was the equivalent of plugging leaks which created more leaks.
Finally, I couldn't take it and asked for a week off. I timed it so it would be right after what would have been the final UAT deployment and I'd be back after they completed their test rounds, so I could fix any new or returning defects.
Today I just found out that fubar got put on hold, that UAT was a failure and all fubar-related work had to stop. I have some mixed feelings on this: I worked hard to get fubar working as business wanted, and I was proud of that. But I also didn't like that fubar was constantly changing in scope and function.
I wonder if anyone else has ever felt the same thing?2 -
worst mistake? plausible
I just chose _system_ as my username, I got a feeling it will be a prime target in a case of database intrusion :/ -
In the 90s most people had touched grass, but few touched a computer.
In the 2090s most people will have touched a computer, but not grass.
But at least we'll have fully sentient dildos armed with laser guns to mildly stimulate our mandatory attached cyber-clits, or alternatively annihilate thought criminals.
In other news my prime generator has exhaustively been checked against, all primes from 5 to 1 million. I used miller-rabin with k=40 to confirm the results.
The set the generator creates is the join of the quasi-lucas carmichael numbers, the carmichael numbers, and the primes. So after I generated a number I just had to treat those numbers as 'pollutants' and filter them out, which was dead simple.
Whats left after filtering, is strictly the primes.
I also tested it randomly on 50-55 bit primes, and it always returned true, but that range hasn't been fully tested so far because it takes 9-12 seconds per number at that point.
I was expecting maybe a few failures by my generator. So what I did was I wrote a function, genMillerTest(), and all it does is take some number n, returns the next prime after it (using my functions nextPrime() and isPrime()), and then tests it against miller-rabin. If miller returns false, then I add the result to a list. And then I check *those* results by hand (because miller can occasionally return false positives, though I'm not familiar enough with the math to know how often).
Well, imagine my surprise when I had zero false positives.
Which means either my code is generating the same exact set as miller (under some very large value of n), or the chance of miller (at k=40 tests) returning a false positive is vanishingly small.
My next steps should be to parallelize the checking process, and set up my other desktop to run those tests continuously.
Concurrently I should work on figuring out why my slowest primality tests (theres six of them, though I think I can eliminate two) are so slow and if I can better estimate or derive a pattern that allows faster results by better initialization of the variables used by these tests.
I already wrote some cases to output which tests most frequently succeeded (if any of them pass, then the number isn't prime), and therefore could cut short the primality test of a number. I rewrote the function to put those tests in order from most likely to least likely.
I'm also thinking that there may be some clues for faster computation in other bases, or perhaps in binary, or inspecting the patterns of values in the natural logs of non-primes versus primes. Or even looking into the *execution* time of numbers that successfully pass as prime versus ones that don't. Theres a bevy of possible approaches.
The entire process for the first 1_000_000 numbers, ran 1621.28 seconds, or just shy of a tenth of a second per test but I'm sure thats biased toward the head of the list.
If theres any other approach or ideas I may be overlooking, I wouldn't know where to begin.16 -
Cracked my first weak RSA implementation challenge today. Feels pretty awesome.
Involved primes that were very close, which means you can factorize the modulus quickly to get the private key. Normally, you would never use close primes as prime factorization's difficulty relies a certain amount on some distance between the two values.
The reason you can brute force close primes has to do with them being close in value to the square root of the function, meaning that you can search far quicker than if you were to try every combination of primes.2 -
Maybe I'm severely misunderstanding set theory. Hear me out though.
Let f equal the set of all fibonacci numbers, and p equal the set of all primes.
If the density of primes is a function of the number of *multiples* of all primes under n,
then the *number of primes* or density should shrink as n increases, at an ever increasing rate
greater than the density of the number of fibonacci numbers below n.
That means as n grows, the relative density of f to p should grow as well.
At sufficiently large n, the density of p is zero (prime number theorem), not just absolutely, but relative to f as well. The density of f is therefore an upper limit of the density of p.
And the density of p given some sufficiently large n, is therefore also a lower limit on the density of f.
And that therefore the density of p must also be the upper limit on the density of the subset of primes that are Fibonacci numbers.
WHICH MEANS at sufficiently large values of n, there are either NO Fibonacci primes (the functions diverge), and therefore the set of Fibonacci primes is *finite*, OR the density of primes given n in the prime number theorem
*never* truly reaches zero, meaning the primes are in fact infinite.
Proving the Fibonacci primes are infinite, therefore would prove that the prime number line ends (fat chance). While proving the primes are infinite, proves the Fibonacci primes are finite in quantity.
And because the number of primes has been proven time and again to be infinite, as far back as 300BC,the Fibonacci primes MUST be finite.
QED.
If I've made a mistake, I'd like to know.11 -
Happy!
Being an Android Dev myself, I bought my first app in Play Store!
Nova Launcher Prime was offered @ ₹10 (~0.15$). No matter how small the contribution is, it's quite a special joy to support another dev!
4 -
Managed to derive an inverse to karatsuba's multiplication method, converting it into a factorization technique.
Offers a really elegant reason for why non-trivial semiprimes (square free products) are square free.
For a demonstration of karatsubas method, check out:
https://getpocket.com/explore/item/...
Now for the reverse, like I said something elegant emerges.
So we can start by taking the largest digit in our product. Lets say our product is 697.
We find all the digits that produce 6 when summed, along with their order.
thats (1,5), (5,1), (2,4), (4,2), and (3,3)
That means for one of our factors, its largest digit can ONLY be 1, 5, 2, 4, or 3.
Lets take karatsubas method at step f (in the link) and reverse it. Instead of subtracting, we're adding.
If we assume (3,3)
Then we take our middle digit of our product p, in this case the middle digit of 697. is 9, and we munge it with 3.
Then we add our remaining 3, and our remaining unit digit, to get 3+39+7 = 49.
Now, because karatsuba's method ONLY deals with multiplication in single digits, we only need to consider *at most* two digit products.
And interestingly, the only factors of 49 are 7.
49 is a square!
And the only sums that produce 7, are (2,5), (5,2), (3,4), and (4,3)
These would be the possible digits of the factors of 697 if we initially chose (3,3) as our starting point for calculating karatsubas inverse f step.
But you see, 25 can't be a factor of p=697, because 25 is a square, and ends in a 5, so its clearly not prime. 52 can't be either because it ends in 2, likewise 34 ending in 4.
Only 43 could be our possible factor of p.
And we *only* get one factor because our starting point has two of the same digit. Which would mean p would have to equal 43 (a prime) or 1. And because p DOESNT (it equals 697), we can therefore say (3,3) is the wrong starting point, as are ALL starting points that share only one digit, or end in a square.
Ergo we can say the products of non-squares, are specifically non-prime precisely because if they *were* prime, their only factors would HAVE to be themselves, and 1.
For an even BETTER explanation go try karatsuba's method with any prime as the first factor, and 1 as the second factor (just multiply the tens column by zero). And you can see why the inverse, where you might try a starting point that has two matching digits (like 3,3), would obviously fail, because the values it produces could only have two factors; some prime thats not our product, or the value one, which is also not our product.
It's elegant almost to the level of a tautology. -
In Fireship's last video, the guy talks about how Amazon moved Prime video's architecture to old-fashioned monolith, from Serverless, and saved a bunch of money and improved performance doing so.
It makes me wonder, what old tech have we put behind us already that will later make a comeback as an 'improved' version of that tech? What do you think?12 -
Hey fellas, especially you security nerds.
I've had asymmetric encryption explained to me a number of times but I can't get a handle on it because no example actually talks in human terms. They always say "two enormous prime numbers", which I understand, but I can't conceptualize.
Can someone walk me through an entire process, showing your math & work, using some very small, single- or double-digit primes? Such as if I were to encrypt the text "hello world" using prime numbers like 3, 5, and 710 -
So all Matrix movies are now on Prime... Not sure when exactly that happened but watching them right now.
Apparently the original was released in 1999 so that's like 20 years ago.
Seems like the image of future AI hasn't changed much.
And I just got kicked off the TV so a group of guests can watch America's Got Talent... :(7 -
The first fruits of almost five years of labor:
7.8% of semiprimes give the magnitude of their lowest prime factor via the following equation:
((p/(((((p/(10**(Mag(p)-1))).sqrt())-x) + x)*w))/10)
I've also learned, given exponents of some variables, to relate other variables to them on a curve to better sense make of the larger algebraic structure. This has mostly been stumbling in the dark but after a while it has become easier to translate these into methods that allow plugging in one known variable to derive an unknown in a series of products.
For example I have a series of variables d4a, d4u, d4z, d4omega, etc, and these are translateable now, through insights that become various methods, into other types of (non-d4) series. What these variables actually represent is less relevant, only that it is possible to translate between them.
I've been doing some initial learning about neural nets (implementation, rather than theoretics as I normally read about). I'm thinking what I might do is build a GPT style sequence generator, and train it on the 'unknowns' from semiprime products with known factors.
The whole point of the project is that a bunch of internal variables can easily be derived, (d4a, c/d4, u*v) from a product, its root, and its mantissa, that relate to *unknown* variables--unknown variables such as u, v, c, and d4, that if known directly give a constant time answer to the factors of the original product.
I think theres sufficient data at this point to train such a machine, I just don't think I'm up to it yet because I'm lacking in the calculus department.
2000+ variables that are derivable from a product, without knowing its factors, which are themselves products of unknown variables derived from the internal algebraic relations of a product--this ought to be enough of an attack surface to do something with.
I'm willing to collaborate with someone familiar with recurrent neural nets and get them up to speed through telegram/element/discord if they're willing to do the setup and training for a neural net of this sort, one that can tease out hidden relationships and map known variables to the unknown set for a given product.17 -
Is there any exact way to get the product of all primes under n multiplied together, without explicitly knowing what those primes are?
Lets call this number V.
Because hypothethetically, if we calculate from the *base* of V, then we can derive easy divisibility rules for V-1 and V+1, as laid out
here:
https://notaboutapples.wordpress.com/...
And then, unless I've misunderstood something, the problem of factorization has been changed from division into an addition and subtraction problem.12 -
!dev
I wanted to buy some lightning deals on Amazon today but the total was like $23.50 and free shipping requires $25.
I bought a few $25+ items last few weeks so I figure they should be able to waive it...
Chat with CS and they're like no we can't.
WELL FCK U!!!!! I'VE ACTUALLY BEEN PRIME FOR 2YRS AND JUST ENDED A FEW MONTHS AGO... AND IMMEDIATELY THEY'RE LIKE, WE DON'T KNOW U...
(The person actually started out saying thanks for being a Prime member)
Not that it'll matter to them... But just needed to rant...3 -
Yesterday I found out that the dirt bag/filter in my vacuum was missing.... So all the dirt ended up in or around the fan... Still worked though but I figured should get a replacement bag... Which isn't should separately.
So I pull up the order in Amazon and go to the product page to see how much it cost.
List price was $30 but there happened to be a lightning deal reducing it to **24.99**
So I just bought it because I happened to be on 30-day Prime trial... So had free shipping no matter what.
But I wonder now was it actually perfect luck or an algorithm at work...
Would I have bought it at $30 or if I didn't have Prime and needed to make up the 1c?
Was this basically just tricking me into buying asap and trying to convince me to keep prime...6 -
Free to good home.
https://store.steampowered.com/app/...
Code: B85LX-ITFZR-GB3P
If you can guess the last digit you can have it.
9 -
being physically disabled is such a nightmare. i have experienced a whole different personality of being dependent on others , being incapable of basic tasks and feeling incomplete all the times. it's very humbling, and i have found a whole new respect for human body and social conduct.
just want to get whole again. don't know how long its going to take a humerus arm fracture to join back on is own, now that i got a plate screwed to the broken parts to keep them together.
the doctors will probably ask me to remove the external brace after a few months followed by exercises for next more months the complete bends/stretch will probably take 6-9 months and bone will join enough in 1-2 year after which i could get the plate removed (this is the happy case, not considering the high risk of my bones getting permanently twisted or plate getting envolped by bone mass )
everything simply sucks till then. imagine getting pushed back in your life by 2+ yrs in your prime age of 25.
farewell to my dreams of adventure sports, senior goals and gappy marriage .
folks, don't do stupid stuff that can get your body into trouble, you WILL regret.8 -
2023 After a big working day ! I just want to relax with an easy movie to watch
The movie
- Political
- overpower woman that spite on man
- the message
- remake, spin off
- predictable as fuck story line
- actors that have no fucking emotions
- plots twist predictable
- predictable boring scary jump
- watch it on netflix, disney+, Amazon prime, HBO, Crave, Helix, Tou.tv for only 25$ a month
- CGI are fucking ugly shit
- story incoherence
- movie are always politicly correct
- i see the camera man in the cars window is fucking obvious
- people working in movie are poor as fuck because shit actors want lot's and lot's of money
- lot of movie are make for the branding not the movie itself
- you notifications are more interesting than the movie itself
- you want to go to the theater... 99$ popcorn and M&M bag of 20 pieces
- kids want to listen something else
- woman want help with the dishes at 10 PM
- no more beer or chips
You know what ? I think i will go feed some duck 🦆 at the park next time7 -
Question:
Do we have any Ingress players around here? What do you think about the upcoming Ingress Prime? I am somehow excited, but only because I just decided to upgrade my mobile phone some days ago 😉 Now the graphics boost can come. 😁 And I really hope that Niantic does not fuck up everything when they plan to be more entry level friendly in the future.
Resistance FTW!26 -
Woke up yesterday to find the OS drive failed in my hypervisor.
24 hours later and amazon prime have delivered a new SSD to get back on track.
Thank god for backups, probably going to setup HA now aswell, but great end to a week :(7 -
Who knows Ingress (The game) here ?
Level 8 here 👋
if(!know) {
//suggestion
google.takeALookAt("Ingress");
}12 -
Many of you know twitch, now think of all the problems they have to tackle to serve livestreams to millions of users and sometimes deliver one livestream to tens of thousands of people around the world.
And this company always shows me the same FUCKING AD FOR THE SAME FUCKING AMAZON PRIME SHOW I DONT EVEN WANT TO WATCH. PLEASE LET AMAZON TELL YOU THAT METHOD HAD NO EFFECT AT ALL.5 -
Fucking Amazon locked my account for "suspicious" activity, just before I would have cancelled the Prime trial I subscribed to last week. I knew I shouldn't have touched this garbage, and here I am, unable to log in, or contact any kind of chat-based support.
At least I blocked Amazon from using my card again, but my movie night is ruined.6 -
My teacher joked in class about trying to get #octothorpe trending. Two days later he's wearing a t-shirt that says it, turns out someone already thought of it and it's on a t-shirt on Amazon with prime shipping lol 2018 is crazy
-
Originally a comment, but thought it made a good rant.
My experience with Amazon so far... (I live in the colony known as Puerto Rico)
2011: Can no longer get free shipping on books. Apparently, we could before because of a "bug"
2015: Your Prime membership no longer gets you 2 day shipping. Only standard shipping.
2017: Free shipping 3-7 days? Now it takes 3 weeks to a 4+ weeks. (Packages get here faster without Prime for some reason)
2018: Tax of 11.5 when buying directly from Amazon.9 -
A prime example of bad UX from the guys at Ubisoft.
They have this 30-day giveaway up to Christmas and it's terrible.
1. They are giving away posters and shit wallpapers in the lowest resolutions, like really, how long would it have taken to export that shit in 4K? Also, that is a cheap as fuck move. You are Ubisoft, give away some games, for fucks sake! Not shit posters in a resolution so low that I can't use it for wallpaper or print it.
2. When you enter the site you don't have a fucking login button! You have to guess that you have to click a number and then it prompts you to login. Also, why the fuck can't you sustain my login from yestersay?
I anyone wants to see this mess it's over at https://30days.ubi.com1 -
Another GeeksForGeeks rant
Wisecrack got me a bit interested in primes (just a passing interest). I looked up their python implementation of "Sieve of Atkin". Wow, is it bad.
First of all, they use PascalCase instead of underscore_natation so that's points off right there.
Their function takes a limit as a parameter (pretty obviously).
Their program breaks if you pass a prime number as a limit. That's right, if you give it a 2, it breaks. Pretty pathetic.
Reading the comments, their Java implementation is wrong too.
For fucks sake guys, if you're going to have an algorithm blog at least write good algorithms.6 -
!dev
Even though I bought Prime for cord-cutting now whenever I need to buy something I have an urge to just buy from Amazon because I feel like I'm making back what I paid since shipping is now free 2-day for anything and 5% cash back...
And when you search for anything, there's usually 1 result that's like Amazon Choice and I see there's a price huge price cut...
But in the back of my mind, I stop and think does this make sense. Could be cheaper elsewhere? Are these deals really deals...
And that $120 was for video and I'm pretty sure Amazon is not losing money no matter how many orders I make our how much I "save"....
And why am I even trying to make back X by doing Y....
Yes totally random but thoughts, how do you think about this?7 -
accurately estimates number of primes under k
from k=29, to k=232 (within +/- 1..2)
ceil(k-((phi/(1/((log(phi**(k-6), phi))/1))))/2)
Played with an alife I made.
And built a system to explore long chains of polynomials where the exponents were prime.
You can look at it if you like here:
https://pastebin.com/3trWAU7v
Don't blame me if your console explodes though!12 -
So I promised a post after work last night, discussing the new factorization technique.
As before, I use a method called decon() that takes any number, like 697 for example, and first breaks it down into the respective digits and magnitudes.
697 becomes -> 600, 90, and 7.
It then factors *those* to give a decomposition matrix that looks something like the following when printed out:
offset: 3, exp: [[Decimal('2'), Decimal('3')], [Decimal('3'), Decimal('1')], [Decimal('5'), Decimal('2')]]
offset: 2, exp: [[Decimal('2'), Decimal('1')], [Decimal('3'), Decimal('2')], [Decimal('5'), Decimal('1')]]
offset: 1, exp: [[Decimal('7'), Decimal('1')]]
Each entry is a pair of numbers representing a prime base and an exponent.
Now the idea was that, in theory, at each magnitude of a product, we could actually search through the *range* of the product of these exponents.
So for offset three (600) here, we're looking at
2^3 * 3 ^ 1 * 5 ^ 2.
But actually we're searching
2^3 * 3 ^ 1 * 5 ^ 2.
2^3 * 3 ^ 1 * 5 ^ 1
2^3 * 3 ^ 1 * 5 ^ 0
2^3 * 3 ^ 0 * 5 ^ 2.
2^3 * 3 ^ 1 * 5 ^ 1
etc..
On the basis that whatever it generates may be the digits of another magnitude in one of our target product's factors.
And the first optimization or filter we can apply is to notice that assuming our factors pq=n,
and where p <= q, it will always be more efficient to search for the digits of p (because its under n^0.5 or the square root), than the larger factor q.
So by implication we can filter out any product of this exponent search that is greater than the square root of n.
Writing this code was a bit of a headache because I had to deal with potentially very large lists of bases and exponents, so I couldn't just use loops within loops.
Instead I resorted to writing a three state state machine that 'counted down' across these exponents, and it just works.
And now, in practice this doesn't immediately give us anything useful. And I had hoped this would at least give us *upperbounds* to start our search from, for any particular digit of a product's factors at a given magnitude. So the 12 digit (or pick a magnitude out of a hat) of an example product might give us an upperbound on the 2's exponent for that same digit in our lowest factor q of n.
It didn't work out that way. Sometimes there would be 'inversions', where the exponent of a factor on a magnitude of n, would be *lower* than the exponent of that factor on the same digit of q.
But when I started tearing into examples and generating test data I started to see certain patterns emerge, and immediately I found a way to not just pin down these inversions, but get *tight* bounds on the 2's exponents in the corresponding digit for our product's factor itself. It was like the complications I initially saw actually became a means to *tighten* the bounds.
For example, for one particular semiprime n=pq, this was some of the data:
n - offset: 6, exp: [[Decimal('2'), Decimal('5')], [Decimal('5'), Decimal('5')]]
q - offset: 6, exp: [[Decimal('2'), Decimal('6')], [Decimal('3'), Decimal('1')], [Decimal('5'), Decimal('5')]]
It's almost like the base 3 exponent in [n:7] gives away the presence of 3^1 in [q:6], even
though theres no subsequent presence of 3^n in [n:6] itself.
And I found this rule held each time I tested it.
Other rules, not so much, and other rules still would fail in the presence of yet other rules, almost like a giant switchboard.
I immediately realized the implications: rules had precedence, acted predictable when in isolated instances, and changed in specific instances in combination with other rules.
This was ripe for a decision tree generated through random search.
Another product n=pq, with mroe data
q(4)
offset: 4, exp: [[Decimal('2'), Decimal('4')], [Decimal('5'), Decimal('3')]]
n(4)
offset: 4, exp: [[Decimal('2'), Decimal('3')], [Decimal('3'), Decimal('2')], [Decimal('5'), Decimal('3')]]
Suggesting that a nontrivial base 3 exponent (**2 rather than **1) suggests the exponent on the 2 in the relevant
digit of [n], is one less than the same base 2 digital exponent at the same digit on [q]
And so it was clear from the get go that this approach held promise.
From there I discovered a bunch more rules and made some observations.
The bulk of the patterns, regardless of how large the product grows, should be present in the smaller bases (some bound of primes, say the first dozen), because the bulk of exponents for the factorization of any magnitude of a number, overwhelming lean heavily in the lower prime bases.
It was if the entire vulnerability was hiding in plain sight for four+ years, and we'd been approaching factorization all wrong from the beginning, by trying to factor a number, and all its digits at all its magnitudes, all at once, when like addition or multiplication, factorization could be done piecemeal if we knew the patterns to look for.7 -
Math question time!
Okay so I had this idea and I'm looking for anyone who has a better grasp of math than me.
What if instead of searching for prime factors we searched for a number above p?
One with a certain special property. BEAR WITH ME. I know I make these posts a lot and I'm a bit of a shitposter, but I'm being genuine here.
Take this cherry picked number, 697 for example.
It's factors are 17, and 41. It's trivial but just for demonstration.
If we represented it's factors as a bit string, where each bit represents the index that factor occurs at in a list of primes, it looks like this
1000001000000
When converted back to an integer that number becomes 4160, which we will call f.
And if we do 4160/(2**n) until the result returns
a fractional component, then N in this case will be 7.
And 7 is the index of our lowest factor 17 (lets call it A, and our highest factor we'll call B) in our primes list.
So the problem is changed from finding a factorization of p, to finding an algorithm that allows you to convert p into f. Once you have f it's a matter of converting it to binary, looking up the indexes of all bits set to 1, and finding the values of those indexes in the list of primes.
I'm working on doing that and if anyone has any insights I'm all ears.9 -
Up all damn night making the script work.
Wrote a non-sieve prime generator.
Thing kept outputting one or two numbers that weren't prime, related to something called carmichael numbers.
Any case got it to work, god damn was it a slog though.
Generates next and previous primes pretty reliably regardless of the size of the number
(haven't gone over 31 bit because I haven't had a chance to implement decimal for this).
Don't know if the sieve is the only reliable way to do it. This seems to do it without a hitch, and doesn't seem to use a lot of memory. Don't have to constantly return to a lookup table of small factors or their multiple either.
Technically it generates the primes out of the integers, and not the other way around.
Things 0.01-0.02th of a second per prime up to around the 100 million mark, and then it gets into the 0.15-1second range per generation.
At around primes of a couple billion, its averaging about 1 second per bit to calculate 1. whether the number is prime or not, 2. what the next or last immediate prime is. Although I'm sure theres some optimization or improvement here.
Seems reliable but obviously I don't have the resources to check it beyond the first 20k primes I confirmed.
From what I can see it didn't drop any primes, and it didn't include any errant non-primes.
Codes here:
https://pastebin.com/raw/57j3mHsN
Your gotos should be nextPrime(), lastPrime(), isPrime, genPrimes(up to but not including some N), and genNPrimes(), which generates x amount of primes for you.
Speed limit definitely seems to top out at 1 second per bit for a prime once the code is in the billions, but I don't know if thats the ceiling, again, because decimal needs implemented.
I think the core method, in calcY (terrible name, I know) could probably be optimized in some clever way if its given an adjacent prime, and what parameters were used. Theres probably some pattern I'm not seeing, but eh.
I'm also wondering if I can't use those fancy aberrations, 'carmichael numbers' or whatever the hell they are, to calculate some sort of offset, and by doing so, figure out a given primes index.
And all my brain says is "sleep"
But family wants me to hang out, and I have to go talk a manager at home depot into an interview, because wanting to program for a living, and actually getting someone to give you the time of day are two different things.1 -
Heads up, fellow tech nerds: if you're an Amazon Prime member and have ever wanted a Raspberry Pi, there's a good deal on a starter kit, 20% off for Prime Day! Search for "CanaKit Raspberry Pi 3 Complete Starter Kit".
I've always wanted to build a project with a Pi, and now mine's coming Friday! Build project suggestions?6 -
I learned to program with the joy of the command line and ASCII rocket ships printed and shell games on GWBasic. It was fat spiral bound manual my Dad gave me when he worked at EDS. My dad then tried to press me to leaning a program for calculating prime and perfect numbers. My dad sort of forgot I was only six and hadn't learned division yet.1
-
Meanwhile today, somewhere in America
Fan - "Apple is great. Added two camera on the same phone and 7MP camera om front. Totally irrational. Who does that. Ever heard anyone provided "7" MP camera, all they provide is non-prime and rational. Apple always bring something new and great that others cant "7 -
It's Friday night and I should keep preparing for an online tech test I will be taking tomorrow.
But I want to just relax and watch my Amazon Prime subscription which I haven't had time for since I've been preparing all week...
The test is for Amazon.3 -
I find it very interesting how many types of primes there are.
This kind of prime number, I think very nice!
What types of primes do you like?
https://sololearn.com/learn/12365/...
6 -
Who doesn't like free* games?
I like me some prime day games!
https://gaming.amazon.com/home
* Amazon Prime subscription required.
15 -
The eggs have to make a symmetrical pattern in the box otherwise something doesn't feel right.
They used to do boxes of 15, which worked perfectly. Now it's either 6 or 12, both of which potentially require you to adjust the number of eggs you eat to get a symmetrical pattern.
It is both necessary and sufficient that the number of holes in the egg box should be an odd number.
Nine and fifteen work really well. All the other odd numbers are either too big, or negative, or prime, which would be impractical.9 -
The move by Amazon to increase prices of Prime seems to me to be a negative move.
Now I’m not saying the increase hurts me financially or anything but it forces people to make a decision where there wasn’t one before.
With a few seconds of though it is easy to see that what we are paying for is their Amazon Prime Video, because there is no change or update to the Prime delivery services.
So now you have to think...
“Is Prime Video worry this increase?”
I don’t know about you, but personally I see Prime Video as a “me-too” product that adds little or no value.
I’ll keep Prime because I order a lot of shit, but others without this frequency of purchase may decide to leave.
Seems like forcing people to make this decision may not be a good move for Amazon.9 -
Signed up for Prime this morning... And just got 2 emails from Amazon recruiters.
Thought all the tech companies had hiring freezes... ¯\_(ツ)_/¯
Either way I'm not on the market.4 -
Oh my....I thought I was doing a very inteligent thing when I bought my Xiaomi Redmi 4 Prime. Comming from an iPhone 5S. This was a cheaper phone with twice the batery power!
I was feeling it you know? This is the thing!
One year later....dang it! They forgot about the phone?
Great specs. No updates by Xiaomi.
Not even a rant just...sad disapointment!
Late December they said.... Nothing...
Damn!11 -
A question on corporate reality, let me know which person is doing it right :
Person A is a young enthusiastic nd curious fresher who has joined an amazing company where there is a team of seniors above him.
They ask him to work on a project, give him some guidelines which he is able to quickly grasp and come back with an output (because he loves learning and working on it and challenges himself to do it quicker than before)
This goes on and on, the new guy is giving his 100%, but company realizes it and starts expecting more of him, his 100% is not satisfactory enough, he is expected to give his 110% . He is now feeling the pressure but still liking it (because he likes learning) even though it has started to effect his personal lifestyle. He no longer has time for friends and even codes during his nap times, but still believes that he's in his prime and its okay for him to grind wheels for a better future
-------------
Person B is a lazy ass half hearted fresher who's good with public relations. He knows he can do a work in 1 hour, but still does it in 2 hours and do it bad.
He is giving his 50% and seniors know it but still are expecting to get just 70-80% out of him because of his charming and cool personna.
He's cool, now dating office girls, actively partying and is now people's favorite and living a lavish life with equal salary as that of the person A.
Who is living their youth correctly?9 -
Playing ME:A, game froze, alt-tab out to try and close it, can see my mouse moving around but the screen the game is playing on is staying black. Whatever, shit happens, I'll just hard power off and reboot.
Powered down, push the power button, SSD isn't booting, being sent to BIOS. "Oh no."
SSD isn't listed in available boot options. "Shit." Checked the cables and what not, nothing, pretty sure it died on me. Go to Fry's to get a new 960 EVO m.2, sold out, go to the other one 30mins away that says it has one in stock, it doesn't either. 😧
Guess I'm ordering one online, Amazon says 1-3 weeks even with Prime, Samsung website says 1-3 days but no rush delivery.
Guess I'm computer-less for a while. (Unless I find something else before end of day)5 -
Amazon prime days sale...
I find a Fire 7 for $30 instead of $50. I think that would be great to put books on. I am thinking Kindle is an Android type device. Even some searches for Android tablets bring up Kindles on Amazon and web.
I get my kindle and like it. I signed up for trial of Kindle Unlimited. There is almost no selection for Kindle Unlimited for technical books. So I think I can just put the Paktpub app on the Kindle. No app for Kindle. That is okay, I can just put the Play store on there. Technically you can, if you side load it, but it will stop functioning after a day. Not an officially licensed Android device so cannot use Google services.
At this point I am not happy with the Kindle. I got it to read technical books and the selection of technical books is poor. At least on Kindle Unlimited. So I start looking at tablets on Amazon.
I find that there is a serious price breakpoint on Android tablets (cannot get Paktpub app for Windows tablets). For $100 (US) they are not very good. At > $150 they start getting really good feature wise. I end up buying a Samsung tablet for $200. It has 2GB ram and 8 cores at 1.6GHz.
I have been using the tablet for a few days now and am happy with what I can do with it. Now I have to wonder if Kindle is actually an upsell product rather than a serious product. I might not have went for a $200 tablet unless I had not had issues with the Kindle. Not sure there. Amazon made out for both product sales as I just gave the Kindle to the kids.
In the end I am very happy. Paktpub has all the tech books I can handle at the moment. Will probably not consider Kindle Unlimited again. This tells me that competition is good in the book sector. Good for the end user.5 -
Heres the initial upgraded number fingerprinter I talked about in the past and some results and an explanation below.
Note that these are wide black images on ibb, so they appear as a tall thin strip near the top of ibb as if they're part of the website. They practically blend in. Right click the blackstrip and hit 'view image' and then zoom in.
https://ibb.co/26JmZXB
https://ibb.co/LpJpggq
https://ibb.co/Jt2Hsgt
https://ibb.co/hcxrFfV
https://ibb.co/BKZNzng
https://ibb.co/L6BtXZ4
https://ibb.co/yVHZNq4
https://ibb.co/tQXS8Hr
https://paste.ofcode.org/an4LcpkaKr...
Hastebin wouldn't save for some reason so paste.ofcode.org it is.
Not much to look at, but I was thinking I'd maybe mark the columns where gaps occur and do some statistical tests like finding the stds of the gaps, density, etc. The type test I wrote categorizes products into 11 different types, based on the value of a subset of variables taken from a vector of a couple hundred variables but I didn't want to include all that mess of code. And I was thinking of maybe running this fingerprinter on a per type basis, set to repeat, and looking for matching indexs (pixels) to see what products have in common per type.
Or maybe using them to train a classifier of some sort.
Each fingerprint of a product shares something like 16-20% of indexes with it's factors, so I'm thinking thats an avenue to explore.
What the fingerprinter does is better explained by the subfunction findAb.
The code contains a comment explaining this, but basically the function destructures a number into a series of division and subtractions, and makes a note of how many divisions in a 'run'.
Typically this is for numbers divisible by 2.
So a number like 35 might look like this, when done
p = 35
((((p-1)/2)-1)/2/2/2/2)-1
And we'd represent that as
ab(w, x, y, z)
Where w is the starting value 35 in this case,
x is the number to divide by at each step, y is the adjustment (how much to subtract by when we encounter a number not divisible by x), and z is a string or vector of our results
which looks something like
ab(35, 2, 1, [1, 4])
Why [1,4]
because we were only able to divide by 2 once, before having to subtract 1, and repeat the process. And then we had a run of 4 divisions.
And for the fingerprinter, we do this for each prime under our number p, the list returned becoming another row in our fingerprint. And then that gets converted into an image.
And again, what I find interesting is that
unknown factors of products appear to share many of these same indexes.
What I might do is for, each individual run of Ab, I might have some sort of indicator for when *another* factor is present in the current factor list for each index. So I might ask, at the given step, is the current result (derived from p), divisible by 2 *and* say, 3? If so, mark it.
And then when I run this through the fingerprinter itself, all those pixels might get marked by a different color, say, make them blue, or vary their intensity based on the number of factors present, I don't know. Whatever helps the untrained eye to pick up on leads, clues, and patterns.
If it doesn't make sense, take another look at the example:
((((p-1)/2)-1)/2/2/2/2)-1
This is semi-unique to each product. After the fact, you can remove the variable itself, and keep just the structure in question, replacing the first variable with some other number, and you get to see what pops out the otherside.
If it helps, you can think of the structure surrounding our variable p as the 'electron shell', the '-1's as bandgaps, and the runs of '2's as orbitals, with the variable at the center acting as the 'nucleus', with the factors of that nucleus acting as the protons and neutrons, or nougaty center lol.
Anyway I just wanted to share todays flavor of insanity on the off chance someone might enjoy reading it.1 -
Taught myself how to program a Texas Instruments 84 graphical calculator to solve the common mathematical equations in high school. Shamelessly copied a lot from the internet but learned quite quickly. Things like solving 2 and 3 degree polynomials, prime factorization or calculating integrals and stuff.
I quite liked how I could make life easier for myself and eventually class mates. Just rolled into software engineering afterwards I guess. No regrets thus far...1 -
!rant
I need opinions: Amazon Fire Stick or Google Chromecast?
I want Hulu, Netflix, Crunchy Roll, Amazon Prime TV, and WWE Network.
I welcome all opinions. Remote strength, price, ease of use, and stability are my main concerns.
I also might jail break it and/or try to develop apps for it.
Sorry if a repost but this is a random thought from an alcohol addled mind.
I would use a laptop on every tv, but cost vs benefit says no.3 -
What's your first instance of a infinite loop which ended badly?
Mine was a loop to calculate prime numbers.
My computer came to a halt within 5 seconds :S4 -
What do you mean by you'll shut down the government?!! The government will go on a fucking strike!!? How the fuck does that work?!! You can't make people pass laws by blackmailing that you'll stop doing your job that's so critical to the country!! You are the fucking president!!
Indian politics and laws are not perfect either... But I can't really imagine a prime minister here pulling shit like this!! Not that if I can't imagine it can't happen... Indian politicians know how to stopping lower and lower! But dafuq is that baffoon of a leader thinking!?6 -
It's prime working hours right now, I'm the only developer in the office and stackoverflow is down. I'm gonna have a panic attack6
-
all video streaming fucker companies have found a new way to promote shitty lies!
Hotstar: "try Hotstar! Rs199/month! first 7days free!"
Amazon prime : "try amazon prime! Rs 129/month! first 30 days free!"
those small numbers are fuckin lies. they have only 2 or 3 supported banks and if yours isn't one of them, then you have no option but to buy their full 365 days non refundable subscription of a larger amount, which strangely accepts *all payment bank cards*
liars. liar liar liars!
7 -
!rant
Just posted some swift code to a server, in a few hours I should have all the prime numbers from 1 to a billion!4 -
Anyone else feel in hindsight, college was a huge waste of money so basically just 4yrs of partying/independence from parents?
Watched Accepted on Prime yesterday which in hindsight send to be the truth...
https://m.imdb.com/title/tt0384793/
I majored in finance and information systems... Well the finance stuff I remember (for stock trading) I could've learned reading some books.
IS... I didn't even need to try since I started coding when I was a kid. SQL, know it already... Matlab/weka, just another language/tool.22 -
OK so here's that App I wrote for scraping recently added Prime Videos info...
It's really pre-alpha and lot's of things to clean up but... it works... for me...
https://github.com/allanx2000/...
You need to relink some of the references... You can download the DLLs here. Haven't cleaned it up yet and don't need EntityFramework.
https://github.com/allanx2000/...
Now why am I posting the source code you ask?!!! Well you see writing an app that tells me what new movies were added so I can add it to my watchlist is a poor investment honestly...
Porbably invested 10 hrs writing it and well that adds more movies to my Watchlist. Watching these movies even at 2x speed still takes 1 hour...
I could/should be doing better things...2 -
My father gave me a couple smartphones to do whatever with.
So what do you guys think I should do with them?
I have an Alcatel onetouch and a Galaxy Core Prime.
So yeah, custom ROM? Tear them apart for parts? Hack them?
I'd love some ideas!5 -
I was looking for the largest known mersenne prime and tried doing this. I guess these are language limitations and don’t know what type of computers can give instant answers for such mathematical calculations. Is this complex than bitcoin hash? May be
4 -
DUPLiCATED SEE COMMENTS
Bug, my feed is full of rants I already upvoted, and reloading it doesn't change the feed, I am on algo mode btw
My phone is a Samsung Galaxy grand prime Android 58 -
Just slogged through the first 9 episodes of Mr. Robot on the shitty USA Now app, just realized I could watch it with Amazon Prime. At least I can watch the last one of this season without commercials or censoring1
-
What the fuck man?!
Amazon did remove Scrubs from german Prime.
The fuck am I supposed to binge on end now?!3 -
Amazon is screwing with me.... So I was writing that Prime Recently Added Videos scraper but it's turning out that the Search results pages' layout changes each time. Like they're running multiple versions of the search engine that return the page in different layouts...
So after figuring out one of them... The whole thing breaks since I need to parse a different html layout...2 -
Partially week 69: I wish I could stop getting distracted by toy problems. Mostly the collatz conjecture. Or counting in prime numbers.
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You know what? You can all go plug your heads into each other's arseholes, Cocoapods people, just like the human centipede. I've had enough with you.
I have several libraries that were created back in version 0.38 or something. All of the sudden, you jump to v1.0 and call it ready for prime time. Except the pod doesn't build anymore and I can't publish to the trunk.
When running pod install on them, I get a hopeful message saying it's "re-creating CocoaPods due to major version update", but 2ms later the humongous pile of dog poo crashes, because it was expecting some file to be somewhere. Still not happy, it messes up the remote URL on git.
So I deleted everything and created a new project using v1.0 and populated it with my library, only to find out that now the project won't build because it's fucking Xcode with your shitty piece of software on top of it.
It's already too much of a pain to deal with Xcode's tantrums, but deliberately having to put up with Cocoapods' horseshit on top of that is just torture.
Hope you lose all internet connectivity for three hours today, right in the middle of something important. Because that's how much of my life you've stolen from me. -
Well fuck Amazon. I am trying to get into my account because for some fucking reason they say my payment method is faulty while they actually write off the subscription of prime of it. But to get into my account I need to login again with 2FA as I have that turned it on. So far so good. But since it's an old phone number I can't login. Well just change the phone number wouldn't you think? Well yes but to change the phone number I need to login in with the old phone number to which I have no longer access 🤦♂️. Eventually found a phone number I could call. I get a lovely lady on the phone which guides me to resetting my password but for that, you guessed it, I need to do the 2FA again. I get send through to the next person as she can't change it for me because of privacy reasons (oh well). That guy first askes the last 4 numbers of my creditcard like 5 times because he can't remember it (write it the fuck down then asshole) then he starts mistaking the 6 for 9 (like how the fuck do you do that) and then the text messages don't come in while I am on the phone with him which he tries to blame to my service provider because they would block Amazon (like why would they do that?). But since I got a text message of them 15 min before I shot that down quickly. Then he finally admitted that they might have a disruption going on. So I think we'll fine I'll just ask my question to him how it's possible that Prime stops working as I am watching it because my payment method is faulty according to them (but manage to write off the subscription) and he starts talking just shit. Just admit that you don't know and connect me to someone who does know how that can happen. In the the end I just hung up because I knew I wasn't getting anywhere with this guy and don't you know it, as I start writing this the text messages come in. Problem solved you would say just out that number in the website and you can change your phone number. Well no because I have to tell the number to the guy who I hung up with because the texts weren't coming in 😒. Now I should call them back but I think I'll wait till tomorrow hopefully the day shift will be a bit more knowledgeable on how shit works and can actually remember 4 digits.2
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Dunno if anyone else has ever used it or if most people just the browser, but the Twitch smart TV app is hot garbage. It takes several seconds to process every remote control input, even just navigating the menus.
It’s the only app on my TV that performs so badly. YouTube/Netflix/Prime all work perfectly, but for some reason Twitch acts like its running on a Windows Vista toaster1 -
!rant, I have a couple of sky hd+ boxes knocking around, we've cancelled our sky subscription as we're big on netflix and amazon prime instead and sky don't want the boxes back. I was going to take the hard drives out (1 TB each) as i could use some more external storage for my work and pics, but before I do so is there anything I can do with the boxes instead?
Afterall they have a circuit board, memory and a chipset, can I replace the sky OS with something else?2 -
I just got my first 17in laptop. It's a dell XPS 9700. I wiped it and installed Arch Linux within minutes of unboxing! lol. I just finished and we're at 6 hours from delivery (4 hours of beer drinking and) 2 hours of config later, I'm posting on devrants. Everything but the audio and nvidia graphics worked OOTB. I'm still working on getting nvidia prime working on Wayland. Tips welcome!5
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I just realized while looking to buy a movie on an Android phone and using prime video and get the error message that I can't buy from the app...
This is pretty much saying only Google play store is the only place you can buy anything now... Feels like Apple but...
It's pretty much a monopoly okay and anticompetitive... Feels like it could get seriously sued for this -
Hang with me! This is *not* a math shitpost, I repeat, it is NOT a math shitpost, not entirely anyway.
It appears there is for products of two non-trivial factors, a real number n (well a rational number anyway) such that p/n = i (some number in the set of integers), whos factor chain is apparently no greater than floor(log(log(p))**2)-2, and whos largest factor is never greater than p^(1/4).
And that this number is at least derivable, laboriously with the following:
where p=a*b
https://pastebin.com/Z4thebha
And assuming you have the factors of p/z = jkl..
then instead of doing
p/(jkl..) = z
you can do
p-(jkl) to get the value of [result] whos index is a-1
Getting the actual factor tree of p/z is another matter, but its a start.
Edit: you have to provide your own product.
Preferably import Decimal first.3 -
Bought a stream deck on prime day with the intention of using them for macros. Now it has arrived, and I realized that I don't have a clue what macros to make.1
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I'm teaching a couple of classes where students (~18 years old) work on their own projects. I just deleted two of those from my machine: one Angular and one Spring Boot, but just boilerplate. Together, they were about 500 MB. I spent 2-3 hours working on a little Go tool to make concurrent HTTP requests and to report statistics on the response time. The entire repository is roughly 500 kB in size, but solves a genuine problem. My students have a bloat ratio of 1000 compared to me as a baseline, but my stuff actually does things. Today, I programmed prime factorization in PHP for some load tests (mod_php vs. PHP-FPM). The PHP script is 1148 bytes long (but the file system reports 4 kB). My students could learn more from such a script than from their overblown "projects", but "PHP sucks" I hearsay, so let's bloat on.12
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Lately I've sort of feel like I've personally plateaued... Outside of work, which is still not very challenging, I don't have any personal problems I want to solve. It sorts feels like for everything I want there's either an app I can download or already built (or at least 90% of it and just needs some adjustments or repurposing).
The strange part is it's getting replaced by solving/looking at algorithm problems.
Originally I was going to do mobile + React but I just don't feel motivated anymore... Even if I did build it I doubt I'd use it and I don't have any mobiles apps I want either...
Maybe I'm just really bored at work so now the equation makes sense...
Bored + would like better job == algorithm puzzles
Though I still need to figure out what to do with my reading list and prime videos... They've sorta been backgrounded... And maybe even devrant as well...
Oh yes haven't watched my big TV for over a month....1 -
WOO!!! Taking cord cutting to the extreme!!
The dual channel TV tuner arrived, took it out for a test drive by setting up a few scheduled recordings.
Quality isn't as good as 4K TV and it takes a lot of space as it doesn't use a compressed format... But no more Prime, commercials, and now can watch at 2x speed! Plus that's what the 1TB HD is for...
Though now my worries about drive failure are coming back...14 -
I realized today the I can actually edit my profile on Indeed Prime so did not have to accept the screwed up profile created by a **professional writer** many months ago...
Maybe now I might attract more interest...
But now after spending 30 minutes on this just realized maybe too late.... FCK... so I wasted all morning when I could've been sleeping.... :(
2 -
Found out that i have amazon prime music with my account for free (i always thought it was £7.99 extra) So mow im going through down loading a load of music and remaking my playlists, in the end it will make me more productive so that's how im justifying it to myself :P
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So last Friday I orders my new camera (Canon EOS 1300D) from Amazon with prime NEXT day delivery
It didn't turn up Saturday even tho I got told it would but I got £20 credit from them for their fuck up.
I was told it would be delivered early the next say (Sunday) and by 3pm it was still not there... Got another £5 from them for their fulse promises.
It arrived later that night at 6:30pm
So yesterday I ordered a tripod using my credit and next day delivery for today and im just wondering of it will arrive or not.
Weird thing is, The reason it was not delivered was because of "network problems"...3 -
I now realize after binging for 3 days that Prime Video is a lost cause.... The time wasted is just not worth it... And my watchlist. I have about 270 movies that I at least need to preview and isn't going to get smaller... Especially if I'm "trying to get my money worth"
Quite frankly it takes the fun out of watching movies... At least for me.
My first annual subscription will end in 2 months. I guess I'll miss the prime shipping but guess I'll go back to grouping orders... Hopefully won't need it though.1 -
Today Niantic killed classic Ingress Scanner. I think I'm going to quit the game. Ingress Prime is awful! I can't get used to it.3
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RIP Good Friday Agreement, the peace and prosperity was great 👍 Boris Johnson will be the prime minister to destroy the union9
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I'm running Void-Linux-musl on my ideaPad-320s and found 2 strange bugs, that I've never seen anywhere else.
1. Firefox-DRM-plugin crashes when I open Netflix or Prime.
2. YouTube videos play at slightly accelerated speed, despite being set to normal speed.
Has any one here ever seen those 2?2 -
I finally have some motivation to write some personal code... on an existing project.
(Work has been too hectic the last few months so don't want to do anymore at home...)
Anyway... I noticed that my Prime Video Tracker app doesn't pick up some of the new Movies now available on Prime, so I did some fixing.
Good News (GN): The search URL is actually static so can goto the same URL for the same search results
GN: The program can filter the movies by a Minimum # of Ratings they have (currently set to 100... use to be 10)
Bad News (BN): The number of movies in the search results is over 5000 (used to be 100-200) so even with this filter, a lot get returned.
GN: the traversal is fully automated
BN: Need to manually look at the descriptions of each and add them the Watchlist
BN: I now have 200 movies on my Watchlist and still going...
So now I have another "Infinite list". Existing ones:
-TED Talks
-NLegs
-Blinkist Read List
-Comics (sort of, I have a huge backlog for Cyanide and Happiness)
-Photos that need "post-processing"
I'm pretty sure I'm forgetting some others...
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Kids for sure are a distraction. Mostly working 40 hours a week and being exhausted from that is the prime factor.
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I bought a LG 4K monitor that has AMD FreeSync because there was a huge discount for Prime Day. Arrived today haven't unpacked but my PC actually has a GeForce 1080...
Did screw up and but the wrong monitor? Or does FreeSync/GSync not matter much?10 -
Got a question on DBMS Normalization. I tried searching but couldn't clear my doubt. So I have a set of functional dependencies for relation R(C, D, E, F, P, R, S) :
F->D
D->F
E->C
P->RC
E->F
S->EFD
PR->EF
So I have to convert this to 3NF. My doubt is that when finding 2NF do we find all the non-prime attributes that are dependent on a particular partial key i.e. do we take it's closure and create new relations for each partial dependency? If we do that then there are overlapping attributes in the resultant relations in this case I found the relations in 2NF as :
R1(P, S)
R2(P, R, C, E, F)
R3(S, E, F, D, C)
But when I just used the FDs as they are given (no closure) I found :
R1(P, S)
R2(P, R, C)
R3(S, E, F, D)
Which one is correct, please help.3 -
'Betas' on amazon prime (original) is pretty damn good, easy watch and funny as hell
It's about a group of developers who create a product and try to find investors while balancing their crazy lives in Silicon Valley, I love it -
Whatcha thinking about the Dell XPS 13 9300?
There's one on discount during the prime days and I'm thinking about buying it.6 -
so hey in this magical world of numerical make believe what is the takeaway ? and ps aren't you guys sick of prime number gens hidden on your machines ?18
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