BOINC Team Science and Research Hessen

Record AP25 & AP24 Found
PrimeGrid 17.12.09 um 05:40

A new record AP25 (Arithmetic Progression of 25 primes) has been found. It is the largest known AP25 and only the 6th discovered. It has an ending term of 139751114244588403 surpassing the previous record of 52115444782777781. It also includes the largest known AP24 with an ending term of 139751114244588403 surpassing the previous record of 108936498476106241. The finder is Rune Nordbøe Skillingstad (runesk) of Norway. He is a member of Team Norway.The AP25 progression is written as 12353443596260323+23793841*23#*n for n=0..24. The AP24 progression is written as 12353443596260323+23793841*23#*n for n=1..24. It was found in the AP26 Search by an NVIDIA GeForce GTX 285 on an Intel i7 CPU 940 @ 2.93GHz running 32 bit Windows...the first significant AP found by a GPU!!! For more details on this find and the AP26 search, please see this forum post.

The Winter Solstice Challenge
PrimeGrid 18.12.09 um 05:47

Only 13 hours remain till the Winter Solstice Challenge. The pre-fires have a nice red glow, and we're expecting them to turn a deep blue once the Challenge begins. Who knows...by the end of the Challenge they may even become white hot. Please come join us in a Winter Festival that is sure warm you up. The top spots for the 2009 Challenge Series are up for grabs.A 3 day (72 hour) Challenge is being offered on PrimeGrid's AP26 Project. Builds are available for Mac, Linux, Windows, Solaris, Cell/BE Linux (Playstation 3), and for the first time, GPU-CUDA23 app. For more information on how to join, please see this forum thread.

The Winter Solstice Challenge
PrimeGrid 20.12.09 um 15:00

Over half way through and the solstice fires are exceptionally bright. So far four new AP24's have been found. Also, there are several very close races in the individual category.The Winter Solstice is almost upon us. It is not too late to come join the Winter Festival and warm yourself by the fires. For more information on how to join, please see this forum thread.

The Winter Solstice Challenge
PrimeGrid 21.12.09 um 15:47

The Winter Solstice is in 3 hours...and so too is the conclusion of the Challenge. Now is the time to start preparing for the finale. Please remember to upload early and often. The server is going to get hit hard as the Challenge draws to an end. We will start to lower "max cache" to help with this. There continues to be a lot of close races so don't miss out on your completed WU's. Best of Luck in these last 3 hours.

The Winter Solstice Challenge
PrimeGrid 21.12.09 um 22:00

The Winter Solstice is here!!! And the results are final. But the night is far from dark. The solstice fires are brighter than ever as the final Challenge of 2009 also happens to be the most active Challenge to date. Over 970K WU's were completed resulting in over 34.4M cobblestones awarded...an astounding amount of work done. Although no AP26 was found, six new AP24's were found along with countless smaller ones.Congratulations to SETI.USA as the top team and Mr. Hankey as the top individual. For more stats and information, please see this forum post This concludes PrimeGrid's 2009 Challenge Series. Overall final results will be posted soon. Many thanks goes out to everyone who participated!!! We wish you a Happy Holidays and see you next year!

2009 Challenge Series
PrimeGrid 24.12.09 um 08:40

PrimeGrid's 2009 Challenge Series has concluded. Congratulations to SETI.Germany (repeat Champion) as the top team and j2satx as the top individual. They are the overall winners to PrimeGrid's 2009 Challenge Series. For a list of other top finishers, please see this forum thread.As always, thank you for your help and support. None of this is possible without YOU! Have a safe and happy Holiday season. See you next year for PrimeGrid's 2010 Challenge Series!

Megabit Prime for 27121 Search
PrimeGrid 26.12.09 um 07:25

On 23 Dec 2009, PrimeGrid's PRPNet found a megabit prime:27*2 2218064+1The prime is 667,706 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 56th overall.

The discovery was made by Honza Cholt (Honza) of the Czech Republic using a dual Intel Xeon @ 3.06GHz with 4GB RAM. This computer took 2 hours 38 minutes and 59 seconds to complete the primality test. Honza is a member of the team BOINC.SK

For more details about this search, please see this forum thread.

New AP25 Found
PrimeGrid Heute um 16:35

A new AP25 (Arithmetic Progression of 25 primes) has been found. It is only the 9th discovered. The finder is Dan Swearingen (endearingswan) of the United States.
The AP25 progression is written as 24715375237181843+19071018*23#*n for n=0..24. It was found by an Intel Pentium 4 @ 3.00GHz running 32 bit Windows XP Professional. For more details on this find and the AP26 search, please see this forum post.