Free-DC
12-15-2017, 10:00 AM
On 13 December 2017, 07:13:55 UTC, PrimeGrid’s The Riesel Problem project eliminated k=273809 by finding the mega prime: 273809*2^8932416-1 (http://primes.utm.edu/primes/page.php?id=124053) The prime is 2,688,931 digits long and will enter Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 29th overall. This is PrimeGrid's 15th elimination. 49 k's now remain. The discovery was made by Wolfgang Schwieger (DeleteNull (https://www.primegrid.com/show_user.php?userid=2663)) of Germany using an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz with 32 GB RAM running Linux. This computer took about 14 hours and 21 minutes to complete the primality test using multithreaded LLR. Wolfgang is a member of the SETI.Germany (http://www.primegrid.com/team_display.php?teamid=11) team. The prime was verified on 15 December 2017, 11:39:55 UTC, by Christian Geffcken (CGe0963 (https://www.primegrid.com/show_user.php?userid=9546)) of Switzerland using an Intel(R) Core(TM) i5-3437U CPU @ 1.90GHz with 8 GB RAM running Microsoft Windows 7 Professional. This computer took about 41 hours and 47 minutes to complete the primality test using LLR. For more details, please see the official announcement (http://www.primegrid.com/download/TRP-273809.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=7754)
More... (http://www.primegrid.com/forum_thread.php?id=7754)