RSS
07-15-14, 06:22 PM
On 27 June 2014, 20:20:40 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=138172 by finding the mega prime: 138172*5^1714207-1 (http://primes.utm.edu/primes/page.php?id=118095) The prime is 1,198,185 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 54th overall. This is the largest known base 5 mega prime. 80 k's now remain in the Riesel Base 5 Problem. The discovery was made by Walter Darimont (Walter Darimont (http://www.primegrid.com/show_user.php?userid=99669)) of Belgium using an Intel Core i7-3770 CPU @ 3.40GHz with 3.8GB RAM running Linux. This computer took about 18 hours and 25 minutes to complete the primality test using LLR. Walter is a member of the Aggie The Pew (http://www.primegrid.com/team_display.php?teamid=2280) team. The prime was verified on 28 June 2014 13:08:49 UTC, by Scott Brown (Scott Brown (http://www.primegrid.com/show_user.php?userid=1178)) of the United States using an Intel Core2 CPU 6600 @ 2.40GHz with 4 GB RAM running Microsoft Windows 7 Enterprise. This computer took about 38 hours and 32 minutes to complete the primality test using LLR. Scott is a member of the Duke University (http://www.primegrid.com/team_display.php?teamid=154) team. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-138172.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=5809)
More... (http://www.primegrid.com/forum_thread.php?id=5809)