About
Prime Numbers are of great interest to mathematicians for a variety of reasons. Primes also play a
central role in the cryptographic systems which are used for computer security. Through the study of Prime Numbers it can
be shown how much processing is required to crack an encryption code and thus to determine whether current security
schemes are sufficiently secure.
PrimeGrid is currently running several sub-projects:
- Twin Prime Search: searching for
gigantic
twin primes of the form k*2n+1 and
k*2n−1.
- Cullen-Woodall Search: searching for
mega primes of forms n*2n+1 and
n*2n−1.
- 321 Prime Search: searching for
mega primes of the form 3*2n±1.
- Prime Sierpinski Project: helping Prime Sierpinski Project solve
the Prime Sierpinski Problem.
Recent Significant Primes
On 23 Mar 2008, 7:57:28 UTC, PrimeGrid, in collaboration with 321 Search found another Mega Prime:
3*24235414−1
The prime is 1,274,988 digits long and enters
The Largest Known Primes Database ranked 14 th overall.
This is 321 Search's first mega prime and 11 th prime overall. It is the second largest found mega-digit prime using LLR. The discovery was made by Dylan Bennett of Canada using an Intel C2D @ 1.66 GHz with 2GB RAM.
This computer took almost 15 hours and 30 minutes to complete the primality test.
Other recent record primes
Known Issues
- Twin Prime Search, Cullen/Woodall Prime Search and Prime Sierpinski Project Sieve does not support Windows 9x/Me.
- Cullen Prime Search subproject do not support Linux.
- Results sometimes crash with computation error.
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News 
2008-08-25 03:00 UTC The Dog Days of Summer Challenge
Sirius has retreated to the horizon, but he refuses to go into the night sky without a prime. While the Challenge is over, the Dog Days remain...so let's put Sirius to sleep by finding that prime. It will take another 3-6 days for most results to be paired and declared valid. Therefore, Challenge rankings will not be finalized until then.
The WU deadline was set to 3 days so unpaired results should be cleaned up quickly. For those who are interested in helping clean up these results, just leave your machines crunching 321 LLR for another 3 days.
For up-to-date information, please see this forum thread.
2008-08-24 04:00 UTC The Dog Days of Summer Challenge
Less than 24 hours remain. Sirius refuses to go back to the night. The only thing that is known to work is by feeding him a prime. So let's find that prime and bring the Dog Days of Summer to an end. :D For more information, please see this forum thread.
2008-08-22 17:55 UTC Server down and back up
PrimeGrid server was inaccessible for about 30 minutes because the network at the datacenter where PrimeGrid and BOINCstats are hosted was down. The datacenter technicians seem to have brought the network back up, but we have no idea if it's going to stay up (the support phones of the hosting provider are down).
Update 18:11 UTC: it seems that the power was cut to the building; the servers were forcibly rebooted. I'm checking for stuck system processes now.
Update 18:15 UTC: validator was stuck; it's fixed now. I think everything is running smooth now.
2008-08-21 02:00 UTC The Dog Days of Summer Challenge
Less than 24 hours till the Dog Days of Summer Challenge . For more information, please see this forum thread.
2008-08-16 02:00 UTC Prime for 321 Prime Search
The cooling rains have started early. In the run-up to the Dog Days of Summer Challenge, PrimeGrid's first 321 Prime Search prime has been discovered. Stay tuned for more details.
UPDATE: 2008-08-18 We are still awaiting contact with prime finder.
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