PrimeGrid

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.
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.
Seventeen or Bust: helping to solve the Sierpinski Problem.
Sophie Germain Prime Search: searching for primes p and 2p+1.
The Riesel problem: helping to solve the Riesel Problem.

You can choose the projects you would like to run by going to the project preferences page.

Recent Significant Primes

On 24 Apr 2010 11:40:07 UTC, PrimeGrid's 321 Prime Search found another Mega Prime:

3·2^6090515-1.

The prime is 1,833,429 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 17^th overall. The discovery was made by David Mumper (Mumps) of the United States using an AMD Quad-Core Opteron 2378 with 8 GB RAM running Linux. Official announcement and decimal representation of the number are available.

On 12 Apr 2010 20:03:44 UTC, PrimeGrid's AP26 Search (Arithmetic Progression of 26 primes) found the first ever AP26:

43142746595714191+23681770*23#*n for n=0..25

The discovery was made by Benoãt Perichon of France using a PS3 running Linux. For more details, please see the official announcement.

Other significant primes

563528·13⁵⁶³⁵²⁸-1 (GW): official announcement | Generalized Woodall

65516468355·2³³³³³³±1 (Twin): official announcement | twin +1; twin -1

6679881·2^6679881+1 (Cullen): official announcement | decimal representation

6328548·2^6328548+1 (Cullen): official announcement | decimal representation

659·2⁶¹⁷⁸¹⁵+1 (PPS): official announcement | Fermat Divisor

519·2⁵⁶⁷²³³+1 (PPS): official announcement | Fermat Divisor

651·2⁴⁷⁶⁶²⁴+1 (PPS): official announcement | Fermat Divisor

3·2^5082306+1 (321): official announcement | decimal representation

3·2^4235414−1 (321): official announcement | decimal representation

3·2^2291610+1 (321): official announcement | decimal representation

3752948·2^3752948−1 (Woodall): official announcement | decimal representation

2367906·2^2367906−1 (Woodall): official announcement | decimal representation

2013992·2^2013992−1 (Woodall): official announcement | decimal representation

Newly reported primes

4343*2^535685+1 (Alan); 2281*2^536272+1 (Sean); 6615*2^536175+1 (Sean); 6057*2^535780+1 (Scott Brown); 5315*2^535383+1 (Jeff17); 7359*2^535617+1 (Nasicus); 2187*2^535518+1 (jees); 9997*2^535360+1 (Peter Widow); 8035*2^535352+1 ([XTBA>TSA] chili69); 3297*2^534479+1 (Snf); 3321*2^535764+1 (ateam); 1589*2^535663+1 (Mican); 1511*2^535181+1 (mrlumu); 3105*2^531895+1 (LookAS); 6741*2^535856+1 ([SG-2W]SoEinWahnsinn); 7353*2^535842+1 (Lumiukko); 4111*2^535828+1 (kto); 9007*2^535164+1 (PoorBoy); 7113*2^535054+1 (Stefan); 6035*2^535009+1 (Mitchell)

Last 24 hours

Top participants by work done in the last 24 hours

University of the Free State Grid	687029.49
bapu	110694.09
[BOINC@Poland] ksysju	81851.59
Kirill	44632.12
dpb	42628.86

Top teams by work done in the last 24 hours

SETI.USA	176568.56
BOINC@Poland	151441.57
SETI.Germany	136544.66
L'Alliance Francophone	77067.49
Ukraine	74291.1

News

The Full Moon Challenge - 24 hrs to go
There is coming soon a gathering of Warewolves and Prime Hunters. Be sure not to mix the two groups up or you might find yourself surrounded by blood thirsty animals!! ;) However, some might say that the two groups are NOT mutually exclusive. :D Come join us this Full Moon for a sporting "hunt" of Top 5000 primes in the Proth Prime Search (LLR) project. Application builds are available for Mac, Linux, and Windows. For more information, please see this forum thread. 24 Jul 2010 18:20:23 UTC · Comment

The Full Moon Challenge
Come howl at the moon with us and "hunt" for Top 5000 primes. It's a GREAT opportunity for you to find one for yourself! Who knows, there may even be the rare Fermat number divisor. :) We hope to establish a single day record for finding Top 5000 primes!

A 24 hour Challenge (25 July) is being offered on PrimeGrid's Proth Prime Search (LLR) application. Builds are available for Mac, Linux, and Windows. For more information, please see this forum thread. 21 Jul 2010 5:42:44 UTC · Comment

PSP finds another Mega Prime
The Prime Sierpinski Project has discovered their third Mega Prime: 90527*2^9162167+1. It is 2,758,093 digits long and will rank as the 12th largest known prime. The project has now found 18 primes total. There are 11 primes left to solve the Prime Sierpinski Problem. For more information, please see this forum post. 1 Jul 2010 18:40:10 UTC · Comment

9 hours til the Birthday/Summer Solstice Challenge
9 hours remain til the "Birthday/Summer Solstice Challenge". Come join us in a 5 day celebration of PrimeGrid's 5th birthday. The 16-21 June Challenge on the The Riesel Problem (Sieve) application will culminate with a finale on the Summer Solstice. For more information, please see this forum post. 16 Jun 2010 2:34:37 UTC · Comment

100M Cobblestones
A belated congratulations to shanky123 of Norway, for becoming the first single user account to reach 100M cobblestones (10 June) at PrimeGrid. An outstanding and amazing accomplishment after being here for just over 9 months.

Additionally, BOINCstats has just become only the 5th team to surpass 100M cobblestones. Congratulations all around. 15 Jun 2010 21:21:19 UTC · Comment

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