PrimeGrid Project News: First Results Published

News and project updates which haven't been added to distributedcomputing.info yet.

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PrimeGrid Project News: First Results Published

Postby Jwb52z » Tue Jun 06, 2006 5:36 am

2006-06-04 16:45:08 UTC First results published
PrimeGrid has published the first prime numbers, http://www.primegrid.com/orig/torrent.php , that have been found. We are using Bittorrent technology for distributing the results to lower the bandwidth usage on the server, but the download might be a bit slow while only a few people have complete file. Therefore we ask you to help distribute the results by downloading and keeping your Bittorrent client open to seed the files.

For more information on Bittorrent, see Wikipedia http://en.wikipedia.org/wiki/Bittorrent .
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Postby Jwb52z » Fri Aug 31, 2007 8:50 pm

Recent Significant Primes
On August 7, 2007, PrimeGrid's servers returned a positive result in the Woodall Prime Search. It was the double check validating that a Woodall prime was found on August 4 2007
2013992*22013992-1
The prime is 606279 digits long and enters The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for Woodall primes and 37th overall.
The discovery was made by Lasse Mejling Andersen of Denmark using an Intel Celeron 2.80 GHz with 512 MB RAM. This machine took a little over 3 hours and 27 minutes to test using the LLR program.
For more details, please see the official announcement http://www.primegrid.com/download/PGWoodall20070804.pdf . Decimal representation of the number is also available http://www.primegrid.com/download/wn2013992.pdf .

On a possibly similar note, those in charge of the site have posted this note:

2007-08-25 15:15 UTC Message to participant "Owner"
Message to project participant known as "Owner" or "big steve": please contact project administrator at admin@primegrid.com. Your computer has made a significant discovery, and we want to know your details before we publicize it.
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Postby Jwb52z » Sat Sep 08, 2007 10:33 am

2007-09-03 15:00 UTC Record Woodall prime number found... again!
On 20 Aug 2007, 2:40:57 UTC, PrimeGrid's servers returned a positive result in the Woodall Prime Search. It was the double check validating that a Woodall prime was found on 13 Aug 2007, 1:42:08 UTC.

2367906*22367906-1

This is the 32nd and largest known to date Woodall prime. It is 712818 digits long and enters The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for Woodall primes and 25th overall.

The discovery was made by Stephen Kohlman of Canada using an Intel C2D 6300 @ 1.86 GHz with 1 GB RAM. This computer took a little over 5 hours and 41 minutes to test using the LLR program. Stephen is a member of Team Canada. For more details, please see the official announcement, http://www.primegrid.com/download/Woodall2367906.pdf . Decimal representation of the number is also available, http://www.primegrid.com/download/wn2367906.pdf .
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Postby Jwb52z » Thu Sep 20, 2007 4:10 am

2007-09-15 18:35 UTC Cullen/Woodall Sieve available
We have released a sieving app for Cullen/Woodall Prime Search. Sieving will help to greatly reduce the amount of probable primes, therefore speeding up the actual prime search. You can choose to run sieve application by visiting project preferences page; please have in mind that the application has just been released, so it may have bugs or issues (although we haven't noticed any).
Supported platforms: Windows 2000/XP/2003/Vista.
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Postby Jwb52z » Sat Dec 29, 2007 11:54 pm

2007-12-29 21:05 UTC Record breaking Woodall prime
On 21 Dec 2007, 10:09:30 UTC, PrimeGrid's Woodall Prime Search found the 33rd and largest known to date Woodall prime:

3752948*23752948-1

The prime is 1,129,757 digits long and enters The Largest Known Primes Database, http://primes.utm.edu/primes/ , ranked 1st for Woodall primes and 13th overall. It's the first found mega-digit prime using LLR.
The discovery was made by Matthew J. Thompson of the United States using an Intel P4 @ 2.8 GHz with 512MB RAM. This computer took almost 15 hours and 11 minutes to complete the primality test.

2007-12-28 20:30 UTC 1 million digit prime
A user of PrimeGrid has discovered a Woodall prime, http://primes.utm.edu/primes/page.php?id=83407 , which is over 1 million digits long. It is the biggest Woodall prime ever discovered, and 13th biggest known prime of any kind. Stay tuned for more details.

Recent Significant Primes
On 21 Dec 2007, 10:09:30 UTC, PrimeGrid’s Woodall Prime Search found the 33rd and largest known to date Woodall prime:
3752948*23752948-1
The prime is 1,129,757 digits long and enters The Largest Known Primes Database, http://primes.utm.edu/primes/ , ranked 1st for Woodall primes and 13th overall. It’s the first found mega-digit prime using LLR.
The discovery was made by Matthew J. Thompson of the United States using an Intel P4 @ 2.8 GHz with 512MB RAM. This computer took almost 15 hours and 11 minutes to complete the primality test.
Decimal representation of the number is also available, http://www.primegrid.com/download/wn3752948.pdf .
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Postby Jwb52z » Mon Feb 16, 2009 3:26 am

12121 Prime Search
2009-02-14 04:10 UTC
We are happy to announce that PrimeGrid is partnering with 12121 Search. Similar to 321 Search (k=3), 12121 Search is searching for single k primes of the form 121*2^n-1. They have been successfully searching since 2004 and are now in the Mega Prime area. For more details on the new search, please see this forum thread, http://www.primegrid.com/forum_thread.p ... true#13574 .

Prime Month
2009-02-10 01:45 UTC
The prime month competition is starting to heat up. Lennart has just recently broken away from the group and has a 3 prime lead. He has a mixture of BOINC and PRPNet primes. Is there anyone who can challenge him for the yellow jersey??? Just under 2/3's of the month remains so there's plenty of time for someone to rein him back into the peloton.

For more information, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#13235 .

GCW13 Mini-Challenge
2009-02-09 04:00 UTC
PrimeGrid user rogue has proposed a "friendly" mini-challenge to find a Generalized Cullen or Woodall base 13 prime on or before Friday, February 13th, 2009. A most ambitious endeavor! It will take the Luck of all the Irish PrimeGrid users for this prime to be found...especially on that date. However, to the finder goes all the spoils of fame (math fame) for these elusive gems!

For more information, please see this forum thread, http://www.primegrid.com/forum_thread.php?id=1224 .

50M Cobblestones
2009-02-08 06:15 UTC
Congratulations to SETI.Germany, http://www.primegrid.com/team_display.php?teamid=11 , the first team to reach 50M cobblestones at PrimeGrid. Also, a special thanks to pschoefer, http://www.primegrid.com/show_user.php?userid=845 , SETI.Germany's administrator at PrimeGrid, who does an excellent job managing PrimeGrid's information for such a large team. Now the race is on for 100M cobblestones...can it be reached by year's end??? and by which team??? :)
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Postby Jwb52z » Sat Feb 21, 2009 3:17 am

321 Sieve
2009-02-19 00:45 UTC
The 321 Sieve has completed its manual effort and is now available in BOINC. Current depth is p=2P for 5M < n < 25M. This is for both +1 and -1 forms. To participate, go to your PrimeGrid preferencesand select 321 Prime Search (Sieve). It's currently available for Linux64 and Windows32/64.
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Postby Jwb52z » Sat Mar 07, 2009 10:38 pm

Fermat Number Divisor
2009-03-07 03:40 UTC
Congratulations to Senji **** (s-yama) of Japan, the discoverer of PrimeGrid's second Fermat Number divisor in the Proth Prime Search project: 519*2^567235+1 Divides Fermat F(567233). It is only the 2nd found Fermat Number divisor of 2009 and 272nd overall. It is the 7th largest Fermat Number divisor in Chris Caldwell's The Largest Known Primes Database. Incidentally, it is a new record for "weighted" Fermat Number divisors.

For more information, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#14214 .
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Postby Jwb52z » Tue Mar 31, 2009 5:59 am

New AP24 Found
2009-03-28 05:40 UTC
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Krzysztof Koczubik (ksysju) of Poland. This is his second AP24 discovery. The progression is written as 6872932294461509+2042703*23#*n for n=0..23. It was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of an AP26.

For more details on this find and the AP26 search, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#14586 .
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Postby Jwb52z » Wed Apr 08, 2009 11:26 pm

Record AP24 Found
2009-04-07 15:30 UTC
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 19898154930924749 surpassing the old record of 19516877252820799. The finder is Pawel Stachowiak (stachu @ fiddex), http://www.primegrid.com/show_user.php?userid=27426 , of Poland. The progression is written as 7960592659339799+2326495*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, http://www.primegrid.com/forum_thread.p ... true#14719 .

New AP24 Found
2009-04-05 19:30 UTC
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Pawel Stachowiak (stachu @ fiddex), http://www.primegrid.com/show_user.php?userid=27426 , of Poland. The progression is written as 6274259724784693+2522655*23#*n for n=0..23. It was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of an AP26.

For more details on this find and the AP26 search, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#14676 .

321 Prime Search finds a Mega Prime
2009-04-05 07:20 UTC
On 3 Apr 2009 15:40:01 UTC, PrimeGrid's 321 Prime Search found another Mega Prime:

3*2^5082306+1

The prime is 1,529,928 digits long and enters Chris Caldwell's The Largest Known Primes Database, http://primes.utm.edu/primes/ , ranked 15th overall. It is the 6th largest Proth prime found and the largest found Mega Prime using LLR.

The discovery was made by Andy Brady (Andy Brady), http://www.primegrid.com/show_user.php?userid=1599 , of the United States using an Intel C2Q Q8200 @ 2.33GHz with 3GB RAM running Windows Vista. This computer took about 14 hours 7 minutes to complete the primality test. Andy is a member of the BOINCstats, http://www.primegrid.com/team_display.php?teamid=1 , team.

For more details, please see the official announcement, http://www.primegrid.com/download/321-5082306.pdf . Decimal representation of the number is also available, http://www.primegrid.com/download/321n5082306.pdf .

321 Prime Search finds a Mega Prime
2009-04-04 14:10 UTC
A PrimeGrid participant has discovered a Mega Prime in the 321 Prime Search! We are currently GFN divisibility testing the prime as well as awaiting contact with the discoverer. It is a top 15 prime and the largest found by LLR. Stay tuned for more details.

Fermat Number Divisor
2009-04-02 01:30 UTC
Congratulations to Eric Embling (Eric E), http://www.primegrid.com/show_user.php?userid=35693 , of the United States, the discoverer of PrimeGrid's third Fermat Number divisor in the Proth Prime Search project: 659*2^617815+1 Divides F(617813). It is the 3rd found Fermat Number divisor of 2009 and 273rd overall. It is the 6th largest Fermat Number divisor in Chris Caldwell's The Largest Known Primes Database. Incidentally, it is a new record for "weighted" Fermat Number divisors

For more information, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#14635 .
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Postby Jwb52z » Fri Apr 10, 2009 10:33 pm

Record AP25 Found
2009-04-09 16:15 UTC
PrimeGrid has found a record AP25 (Arithmetic Progression of 25 primes). This is PrimeGrid's first AP25 and only the second known. It is the largest AP25 having an ending term of 15523154536267043 surpassing the old record of 8132758706802551. It is also the AP25 with smallest known start 2960886048458003, the previous record being 6171054912832631.

The finder is BOINC@Poland's "Super Computer" (SKB@P), http://www.primegrid.com/show_user.php?userid=21185 . It is a farm of machines funded by BOINC@Poland, http://www.primegrid.com/team_display.php?teamid=2 , members. The progression is written as 2960886048458003+2346233*23#*n for n=0..24. It was found in the AP26 Search.

For more details on this find and the AP26 search, please see this forum post, http://www.primegrid.com/forum_thread.p ... true#14757 .
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Postby Jwb52z » Mon Apr 27, 2009 2:42 am

World Record Cullen Mega Prime found
2009-04-21 02:10 UTC
On 20 Apr 2009 0:52:45 UTC, PrimeGrid's Cullen Prime Search found a World Record Cullen Mega Prime:

6328548*26328548+1

The prime is PrimeGrid's largest prime to date. It is 1,905,090 digits long and enters Chris Caldwell's The Largest Known Primes Database, http://primes.utm.edu/primes/ , ranked 14th overall. It is the largest Cullen prime found and the largest found Mega Prime using LLR.

The discovery was made by Dennis R. Gesker (Gesker) of the United States using an Intel Xeon E5420 @ 2.50GHz with 8GB RAM running Windows Server 2008. This computer took 32 hours 28 minutes to complete the primality test.

Official announcement and decimal representation to come...

World Record Cullen Mega Prime found
2009-04-20 19:00 UTC
A PrimeGrid participant has discovered a World Record Cullen Mega Prime in the Cullen Prime Search. This is a very special and rare find. It is only the 15th Cullen prime known. It is also a top 15 prime and the largest found by LLR. Additionally, it is PrimeGrid's largest prime to date. Stay tuned for more details.
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Postby Jwb52z » Tue May 12, 2009 11:43 pm

Mac OS X support!
2009-05-11 9:00 UTC
We have released first PrimeGrid application for Mac OS X, Arithmetic Progression of 26 Primes Search (AP26). Mac OS X 10.3 running on PPC, 10.4 running on Intel and 64bit 10.5 running on Intel are supported.

Thanks to Iain Bethune for compiling the apps.

Record AP24 Found
2009-05-06 18:30 UTC
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24 as well as the AP24 with smallest known start.

The finder is Andreas Kobara (Lexs, http://www.primegrid.com/show_user.php?userid= 20289) of Germany. He is a member of the Gentoo Linux Users Everywhere, http://www.primegrid.com/team_display.php?teamid=196 , team. The progression is written as 167806194923077+4935146*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, http://www.primegrid.com/forum_thread.p ... true#15418 .
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