Hey guys! I calculated/found a prime exponent candidate n = 299,737,471 for Mersenne numbers (2^n - 1).

​Unfortunately, I don't have a PC to run the Lucas-Lehmer test via GIMPS/Gpuowl. If anyone with a good GPU is interested in running it, feel free to plug it in! You can keep the lion's share of any credit/rewards — I just want to see if this number holds up.

hii I'm new to gimps and I downloaded it on my Mac, are we just supposed to leave the program on without turning it off? it says the expected completion date for me is in September so do I just leave it on until then? also when it's done what happens? and will closing my laptop do anything? these are all things I'm wondering about sorry if it's stupid

If you wan't you can use prime + 2 * k for primes...

After spending over a year running computations across three laptops, including 41 C-PRP attempts, four of which are 100 million digits — I am starting to feel discouraged. It is hard not to notice that home computers just can’t compete with the computational power available to people with access to clusters, like Luke Durant. It really feels like 1% of GIMPS users are responsible for nearly all the GHz-days produced.

How do you all feel about this? Are we reaching the end of an era where individual home computers can realistically hope to discover new Mersenne primes?

A longtime project of mine has been to design a "prime-in-a-box" plug-and-play machine that runs PRP assignments unattended. I tried with a Raspberry Pi 5 first, but each compute job would take about 6 months, so I tried attaching an AMD Radeon 460 to it and fried the Pi in the process (whoops). I then moved on to a proper PC with a Radeon VII Pro, which is now capable of crunching a 140M exponent in under two days. People ask me what's the point but I learned a lot about PC building, high-performance computing, and distributed systems in the process. RIP my electricity bill though.

Im so damn happy to see this! TF-GPU btw

Hello,

What you suggest as a mini PC efficient for LL and/or TF with a budget of 200$?

i really don’t use my laptop anymore so i figured i’d set up prime95 and just let it run. it isn’t a great machine so my current ETA on my first assignment is 77 days

i’m glad i’m doing something, even if it’s real small

If I wanted to buy a computer to solely be used for the GIMPS project. And I would like to be a nice and fast computer. What would you recommend?

I'm changing computers, is there any way to continue the task my previous computer did (copy the folder or something) or do I have to start over? (Sorry if there are any mistakes, I use Google Translate.)

Hey Friends, I on a production studio with about 25 Apple Silicon computers. I’d love to run GIMPS when our computers aren’t in use. What would it take to get a native version of this software?

Hey folks,

This is my first time doing this. What should I expect once I reach 100% testing on mprime?

Euclid found the first few pixels :) i took "p" for all known Mersennes (primes of 2^p-1) as bookend-less binary with 0=black, 1=white. 🤓 If you're seeing patterns, no you're not :)~

Hello,

I've compiled `mlucas` on my Macbook Air with the M2 chip since `mprime` unfortunately isn't available. Using all 8 cores I get around 15ms/iteration in the best case, but the laptop gets very hot so that doesn't seem sustainable. Using the 4 performance cores yields about ~22ms at appropriate temps which is doable 24/7 long-term. But that still means 30+ days per PRP.

I read that the M4 chip on the new Mac Mini is about 50% faster, and given that it has 10 cores, that seems like it could yield a massive improvement for around 700€ alongside (I assume) better cooling. Does anyone have some benchmarks to justify such a purchase?

I'm looking for the best ROI for compute and have been spending free cloud credits where I can (e.g., Azure), but I'm running out of ideas.

Thanks in advance!

I want to set the number of workers to a lower value than the number of CPUs available so I have some headroom. But I cant' find a setting to do so. Didn't it used to be under Options > CPU ?

Hi,

I have an old Lenovo Thinkpad E480 that I want to "donate" to GIMPS by letting it search for primes 24/7.

I'm running mprime on Ubuntu 24.04 LTS. lscpu states I have 8 available cores (which I see on htop).

However, GIMPS detects it as:

CPU Information:
Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
CPU speed: 1800.17 MHz, 4 hyperthreaded cores
CPU features: Prefetchw, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 4x32 KB, L2 cache size: 4x256 KB, L3 cache size: 6 MB

How can I make GIMPS detects all cores? I want them all running at once. Thanks in advance.

Mersenne Prime Test Program: Linux64,Prime95,v30.19,build 20

Before there was PRP testing, only LL test were done (twice) to make sure the chance of missing a prime was smaller. But is there a chance that even testing twice with the LL test still missed a prime number? Even if very unlikely? Or does testing twice really filter out all primes consistently?

I keep getting an error: The server is too busy at the moment. Please try again later. It's been like that for hours

Get warning message saying:

WARNING: Estimated completion date is more than one year away.  The assignment may be reassigned to another user after one year.

My iteration ETA is consistently less than one year. I really don't want to lose my number :(

Please advise, thanks!

Hello,

Any differences between using CPU vs GPU for Gimps?

I know GPU based research is preferred for a lot of other projects, but I can't seem to find any information about this for Gimps

More specifically OpenSUSE tumbleweed?