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11-05-18, 12:23 PM
On 31 October 2018, 00:42:47 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime: 1059094^1048576+1 (https://primes.utm.edu/primes/page.php?id=125753) The prime is 6,317,602 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 1st for Generalized Fermat primes and 13th overall. This is the second-largest prime found by PrimeGrid, and the second-largest non-Mersenne prime. The discovery was made by Rob Gahan (Robish (http://www.primegrid.com/show_user.php?userid=126266)) of Ireland using a Nvidia GeForce GTX 1080 in an Intel(R) Core(TM) i7-7820HK CPU at 2.90GHz with 32GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 3 hours 35 minutes to probable prime (PRP) test with GeneferOCL4. Rob is a member of the Storm (http://www.primegrid.com/team_display.php?teamid=3983) team. The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This computer took about 4 days, 5 hours, 54 minutes to complete the primality test using multithreaded LLR. For more details, please see the official announcement (http://www.primegrid.com/download/GFN-1059094_1048576.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=8274)
More... (http://www.primegrid.com/forum_thread.php?id=8274)