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09-12-14, 02:33 PM
On 17 August 2014, 13:00:59 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=133778 by finding the mega prime: 133778*5^1785689+1 (http://primes.utm.edu/primes/page.php?id=118360) The prime is 1,248,149 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 56th overall. This is the largest known base 5 mega prime. 38 k's now remain in the Sierpinski Base 5 Problem. The discovery was made by Guo Hua Miao (???? (http://www.primegrid.com/show_user.php?userid=192459)) of China using an Intel Xeon(R) CPU E5- 4617 @ 2.90GHz with 504GB RAM running Linux. This computer took about 27 hours and 9 minutes to complete the primality test using LLR. Guo is a member of the Team China (http://www.primegrid.com/team_display.php?teamid=124) team. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-133778.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=5885)
More... (http://www.primegrid.com/forum_thread.php?id=5885)