Free-DC
01-31-2016, 09:09 PM
On 11 January 2016, 10:02:08 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=306398 by finding the mega prime: 306398*5^2112410-1 (http://primes.utm.edu/primes/page.php?id=120887)The prime is 1,476,517 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 50th overall. This is the largest known base 5 mega prime. 77 k's now remain in the Riesel Base 5 Problem.The discovery was made by André Ahlfors Dahl (NocFlame (http://www.primegrid.com/show_user.php?userid=15159)) of Sweden using an Intel(R) Xeon(R) CPU W3520 @ 2.67GHz with 16GB RAM running Linux. This computer took about 77 hours 10 minutes to complete the primality test using LLR. André is a member of the Gridcoin (http://www.primegrid.com/team_display.php?teamid=4469) team. The prime was verified on 17 January 2016, 19:36:26 UTC by evaotaku00 (http://www.primegrid.com/show_user.php?userid=173071) of the United States using an Intel(R) Xeon(R) CPU X5355 @ 2.66GHz with 24GB RAM running Darwin. This computer took about 77 hours 10 minutes to complete the primality test using LLR. evaotaku00 is a member of the Ars Technica (http://www.primegrid.com/team_display.php?teamid=182) team. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-306398.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=6630)
More... (http://www.primegrid.com/forum_thread.php?id=6630)