RSS
06-05-16, 03:00 PM
On 30 May 2016, 18:15:42 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=53546 by finding the mega prime: 53546*5^2216664-1 (https://primes.utm.edu/primes/page.php?id=121722) The prime is 1,549,387 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 48th overall. This is the largest known base 5 mega prime. 75 k's now remain in the Riesel Base 5 Problem. The discovery was made by Tom Greer (tng* (http://www.primegrid.com/show_user.php?userid=66603)) of the United States using an Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz with 32GB RAM running Microsoft Windows 7 Professional. This computer took about 29 hours 24 minutes to complete the primality test using LLR. Tom is a member of the Sicituradastra. (http://www.primegrid.com/team_display.php?teamid=1596) team. The prime was verified on 2 June 2016, 01:20:10 UTC by John Parker (Mike Parker (http://www.primegrid.com/show_user.php?userid=10331)) of the United States using an Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz with 16GB RAM running Microsoft Windows 10. This computer took about 80 hours 8 minutes to complete the primality test using LLR. John is a member of the SETI.USA (http://www.primegrid.com/team_display.php?teamid=189) team. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-53546.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=6852)
More... (http://www.primegrid.com/forum_thread.php?id=6852)