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01-31-16, 08:58 PM
On 10 November 2015, 07:16:15 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=154222 by finding the mega prime:154222*5^2091432+1 (http://primes.utm.edu/primes/page.php?id=120533)The prime is 1,461,854 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 51st overall. This is the largest known base 5 mega prime. 35 k's now remain in the Sierpinski Base 5 Problem.The discovery was made by Scott Brown (Scott Brown (http://www.primegrid.com/show_user.php?userid=1178)) of the United States using an Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz with 16GB RAM running Windows 10 Professional. This computer took about 5 hours and 5 minutes to complete the primality test using LLR. Scott is a member of the Duke University (http://www.primegrid.com/team_display.php?teamid=154) team.For more details, please see the official announcement (http://www.primegrid.com/download/SR5-154222.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=6629)
More... (http://www.primegrid.com/forum_thread.php?id=6629)