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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PrimeGrid User of the Day
  michael-u5a1Ich heisse Michael, bin 1964 in Hranice in Maehren in der Tschchischen Republik geboren, wohne seit 1980 in Bonn, Deutschland.
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News 
2008-07-22 6:20 UTC Back online
Database has been recovered, please read a lengthy explanation in this forum thread.
2008-07-21 21:00 UTC Database issues
We are having database issues...stay tuned for more information.
2008-07-21 14:45 UTC The Lunar Landing Challenge
"Houston, Tranquility Base here. The Eagle has landed." The Lunar Landing Challenge is over. Over 525,000 WU's were completed by 193 teams and 1331 individuals. Congratulations to SETI.Germany as the top team and Banshee as the top individual. For more stats and information, please see this forum post.
2008-07-19 00:00 UTC The Lunar Landing Challenge
T-plus 24 hours after liftoff and all systems are nominal. :) The start severely stressed the vehicle, but it eventually made it into orbit. 48 hours remain until the Lunar Landing. For more information, please see this forum thread.
2008-07-17 14:00 UTC The Lunar Landing Challenge
T-minus 10 hours till liftoff and all systems are go. A 3 day (18-20 July - 72 hour) Lunar Landing Challenge is being offered on PrimeGrid's Prime Sierpinski Project sieve application. For more information, please see this forum thread.
Last 24 hoursTop participants by credit granted in the last 24 hoursTop teams by credit granted in the last 24 hours |
