PrimeGrid
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  1. Read our rules and policies.
  2. Download, install and run the BOINC software used by PrimeGrid.
  3. When prompted, enter the URL:
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Available: 321 Prime Search (LLR) 187 User/Host Count 33874/105496 (3.11 hosts per user) PrimeGrid's 2010 Challenge Series
The Calendula Challenge
24 September 18:00 UTC – 7 October 18:00 UTC


Dog Days of Summer Challenge
Final Standings
Participants | Teams
Available: Cullen Prime Search (LLR) 93 Tasks in Progress 75673
Available: Prime Sierpinski Problem (LLR) 194 UTC time 2010-09-02 17:55:22
Available: Proth Prime Search (LLR) 2935 Powered by BOINC
Supported platforms: Windows; Linux; Mac OS; PlayStation 3; Solaris
Available: Seventeen or Bust (LLR) 217
Available: Sophie Germain Prime Search (LLR) 2991
Available: The Riesel Problem (LLR) 290
Available: Woodall Prime Search (LLR) 93
Available: 321 Prime Search (Sieve) 43087
Available: Cullen/Woodall (Sieve) 24450
Available: Proth Prime Search (Sieve) 14037
Available: PSP/SoB (Sieve) 42661
Available: The Riesel Problem (Sieve) 17582

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:
3·26090515-1.
The prime is 1,833,429 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 17th 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 AP26 will be listed in Jens Kruse Andersen's Primes in Arithmetic Progression Records page.
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
6679881·26679881+1 (Cullen): official announcement | decimal representation
6328548·26328548+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
3752948·23752948−1 (Woodall): official announcement | decimal representation
2367906·22367906−1 (Woodall): official announcement | decimal representation
2013992·22013992−1 (Woodall): official announcement | decimal representation

Newly reported primes

7615932645765*2^666666-1 (Banzai); 8065*2^545428+1 (dl5sfk); 3847448135475*2^666667-1 (bayanne); 5805*2^545358+1 (Steve_Martin@SETI.USA); 3217844556435*2^666666-1 (SEARCHER); 3832571589285*2^666667-1 (kto); 3145*2^545368+1 (Steve_Martin@SETI.USA); 1061*2^787597+1 (Dan T. Morris); 3831248189445*2^666667-1 (ateam); 7469*2^545295+1 (Alan); 5607*2^545254+1 (dh1saj); 9115*2^545184+1 (mikey); 3281*2^545095+1 ([GPU Vision] OxyOne); 7347*2^545086+1 (Jeremy Posner); 6815*2^542365+1 (uy2006); 9537*2^541482+1 (kiekske); 3654938546175*2^666666-1 (Matthew); 1097*2^787323+1 (Kid_a); 479738100345*2^666670-1 (Rallysta74); 2035*2^544972+1 (Steve_Martin@SETI.USA)

Last 24 hours

Top participants by work done in the last 24 hours

University of the Free State Grid693741.42
shanky123300125.95
bapu198481.67
Scott Brown94651.5
[BOINC@Poland] ksysju91259.63

Top teams by work done in the last 24 hours

SETI.USA362137.75
Team Norway336926.34
PrimeSearchTeam329901.62
BOINC@Poland199514.12
SETI.Germany196854.05

PrimeGrid User of the Day

User profile Profile DistroManProject donor
I\'m from Sydney Australia, 50 something and a retired computer consultant. My hobbies are genealogy, local history and computers. Crunching for...

News RSS feed

Planned maintenance tonight
Tonight we might have a downtime because of some maintenance in the datacenter. Fill your caches!

[update] After the maintenance the servers did not respond so we had to do a hard reboot. Hopefully everything is fine now.
24 Aug 2010 15:11:01 UTC · Comment


The Dog Days of Summer in 24 hours
When will the end come to this summer heat??? As soon as Sirius is separated from the sun!!! In 24 hours, come join us to help hasten Sirius' departure and thus, bring back cooler days. A 48 hour Challenge is being offered on the 321 Prime Search (Sieve). For more information, please see this forum thread. 19 Aug 2010 18:17:32 UTC · Comment


The Dog Days of Summer in 2 days
The time draws near to the chase. Sirius must be driven away from the Sun so that we can rid ourselves of this long hot sweltering summer (Northern Hemisphere). In 2 days, the Dog Days of Summer Challenge will begin. The 48 hour Challenge is being offered on PrimeGrid's 321 Prime Search (Sieve) application. Please come join us as we quicken the return of cooler days. :) For more information, please see this forum thread. 18 Aug 2010 14:18:51 UTC · Comment


PrimeGrid Donation Drive 2010 Fall
PrimeGrid is a project that is not financed by universities or commercial entities. In fact, all of our funding comes from the community, most of it through the donations page and a small amount through Google ads on the site. In the previous months donations were enough to cover all expenses running the website, however, the last few months have been particularly bad and just paying for server collocation has cut deep into our emergency funds.

It is never easy to be asking for money, but it has come to the point where we have to. We currently have money to keep the servers running for two more months. After that, we either shut down or throttle down significantly, which would be a shame having established PrimeGrid as a significant power in the prime number community, and having received uncountable hours of support from the members.

Therefore, we are launching PrimeGrid Donation Drive 2010 Fall. We have set the target to €4000, which would allow us continue the service for a whole year and would also restore our emergency funds.

No matter how small the donation, it still helps! However, we have to keep the minimum amount at €2 because of PayPal fees (if you prefer to donate through bank transfer, we have bank accounts in the Netherlands, Germany, Poland and Lithuania - please write a private message to me and the details will be sent to you).

To help keep the project running, please visit donations page, select the donation drive item and make a donation that you feel is suitable. Thank you in advance!

Update 2010-08-17 07:30 Big thanks to everyone who has donated already, we have almost reached 15% of the target amount. In addition, we now have a German bank account for direct transfer. If you want to make a direct deposit, please let me know by a private message.

Update 2010-08-18 15:30 By now we have almost reached 30%! Thank you for incredible support! In addition, Polish bank account has been added to the list for direct transfers.
16 Aug 2010 15:18:22 UTC · Comment


The Dog Days of Summer Challenge
The Dog Days are approaching! In just 10 days, PrimeGrid's Challenge series continues with the Dog Days of Summer Challenge. Please come join us in ushering an end to the hot sweltering days of summer. A 2 day (20-22 August) Challenge is being offered on PrimeGrid's 321 Prime Search (Sieve) application. Builds are available for Linux, Mac and Windows. For more information, please see this forum thread. 10 Aug 2010 13:37:09 UTC · Comment


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