About
PrimeGrid's primary goal is to bring the excitement of prime finding to the "everyday" computer user. By simply
downloading and installing BOINC and attaching to the PrimeGrid project,
participants can choose from a variety of prime forms to search. With a little patience, you may find a large or even record
breaking prime and enter into Chris Caldwell's The Largest Known Primes Database as
a Titan!
PrimeGrid's secondary goal is to provide relevant educational materials about primes. Additionally, we wish to contribute to the
field of mathematics.
Lastly, primes 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:
- 321 Prime Search: searching for
mega primes of the form 3·2n±1.
- AP26 Search: searching for an Arithmetic Progression of 26 primes.
- Cullen-Woodall Search: searching for
mega primes of forms n·2n+1 and
n·2n−1.
- Prime Sierpinski Project: helping Prime Sierpinski Project solve
the Prime Sierpinski Problem.
- Proth Prime Search: searching for primes of the form k·2n+1.
- Twin Prime Search: searching for
gigantic
twin primes of the form k·2n+1 and
k·2n−1.
Recent Significant Primes
On 20 Apr 2009 0:52:45 UTC, PrimeGrid's Cullen Prime Search found a World Record Cullen Mega Prime:
6328548·26328548+1
The discovery was made by Dennis R. Gesker of the United States using an Intel Xeon E5420 @ 2.50GHz with 8GB RAM running Windows Server 2008.
Other recent record primes
Newly reported primes63423340839*2^333333-1 (pschoefer); 63325269375*2^333333-1 (Philippe85); 63452946291*2^333333-1 (Archetype450); 3625*2^460792+1 (unconnected); 63410925291*2^333333-1 (Augustine); 9475*2^460656+1 ([AF>HFR>RR]bcoz); 6615*2^460549+1 (Tim Frost); 63287711541*2^333333-1 (urban_trail); 63265792485*2^333333-1 (John_Lawson); 63401857629*2^333333-1 (KE7AAR); 63354557205*2^333333-1 (KE7AAR); 315*2^658900+1 (dh1saj); 5549*2^460689+1 (Pilgrim); 3705*2^458865+1 (misior); 1791*2^460696+1 (dh1saj); 3385*2^460656+1 (roadrunner_gs); 9929*2^460577+1 (Mike Parker); 8293*2^460594+1 (Buckeye74); 5377*2^460512+1 (BudeII); 6775*2^460444+1 (BudeII) Last 24 hoursTop members by work done in the last 24 hours | Top teams by work done in the last 24 hours |
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PrimeGrid User of the Day
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News 
Record AP24 Found
2009-07-4 13:25 UTC
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 60739320360456407 surpassing the old record of 60312982868878297. The finder is Carsten Hartwig (SG Arsenic) of the United Kingdom. He is a member of the SETI.Germany team. The progression is written as 13432401425380607+9219580*23#*n for n=0..23. It was found in the AP26 Search.
For more details on this find and the AP26 search, please see this forum post.
AP26 application available for Solaris
2009-07-01 06:30 UTC
We have released a version of AP26 application for 64bit Solaris (on AMD x86_64 or Intel EM64T CPUs, platform name x86_64-pc-solaris). This is our first application for this platform, which also makes AP26 an application that runs on the most platforms. Thanks to Gerrit Slomma for building the app!
Psst... the PS3 version is coming ;)
Record AP24 Found
2009-06-30 19:50 UTC
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 60312982868878297 surpassing the old record of 25490711550130537. The finder is (AFXTBA Pitheque) of France. He is a member of the L'Alliance Francophone team. The progression is written as 14992521666441877+8832442*23#*n for n=0..23. It was found in the AP26 Search.
For more details on this find and the AP26 search, please see this forum post.
New Top Host!
2009-06-20 02:05 UTC
Congratulations to Worldwide Center of Mathematics, owner of the new top host at PrimeGrid. While this position has changed many times in the past, what makes this occasion unique is that this is the first time the top host is a Mac!!!
EDIT: The above is in terms of RAC. In terms of total credit, UL1 holds a commanding lead of over 5M cobblestones with this host.
The sieves have been Mac'd out!
2009-06-15 03:25 UTC
321, PPS, and PSP sieves now have application support for Mac OS X 10.4 running on Intel and 10.5 running on 64bit Intel. PPS sieve also offers application support for Mac OS X 10.3 running on PPC.
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