Free-DC
03-29-2016, 10:56 PM
On 6 March 2016, 07:54:42 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=77072 by finding the mega prime: 77072*5^2139921+1 (http://primes.utm.edu/primes/page.php?id=121379) The prime is 1,495,746 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 53rd overall. This is the largest known base 5 mega prime. 34 k's now remain in the Sierpinski Base 5 Problem. The discovery was made by Wolfgang Becker (flex (http://www.primegrid.com/show_user.php?userid=52041)) of Germany using an Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz with 4GB RAM running Windows 10 Professional. This computer took about 10 hours 42 minutes to complete the primality test using LLR. Wolfgang is a member of the BOINC@Heidelberg (http://www.primegrid.com/team_display.php?teamid=59) team. The prime was verified on 9 March 2016, 22:19:31 UTC by Magnus Karlsteen (pep (http://www.primegrid.com/show_user.php?userid=83945)) of Sweden using an Intel(R) Xeon(R) CPU X5690 @ 3.47GHz with 24GB RAM running Windows 7 Professional. This computer took about 9 hours 9 minutes to complete the primality test using LLR. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-77072.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=6733)
More... (http://www.primegrid.com/forum_thread.php?id=6733)