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03-23-17, 10:44 AM
On 22 March 2017, 09:33:58 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime: 2676404^262144+1 (http://primes.utm.edu/primes/page.php?id=123187) The prime is 1,684,945 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 5th for Generalized Fermat primes and 52nd overall. The discovery was made by Wolfgang Schwieger (DeleteNull (https://www.primegrid.com/show_user.php?userid=2663)) of Germany using an NVIDIA GeForce GTX 1070 in an Intel(R) Core(TM) i7-6700K CPU at 4.00GHz with 16GB RAM, running Linux. This GPU took about 16 minutes to probable prime (PRP) test with GeneferOCL4. Wolfgang is a member of the SETI.Germany (http://www.primegrid.com/team_display.php?teamid=11) team. The prime was verified on 22 March 2017, 23:16:34 UTC by William de Thomas (wdethomas (https://www.primegrid.com/show_user.php?userid=435653)) of Puerto Rico using an NVIDIA GeForce GTX Titan X in an Intel(R) Core(TM) i7-4790K CPU at 4.00GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 18 minutes to probable prime (PRP) test with GeneferOCL4. William is a member of the Puerto Rico Assisting Science (http://www.primegrid.com/team_display.php?teamid=3688) 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. This computer took about 8 hours 40 minutes to complete the primality test using LLR. For more details, please see the official announcement (http://www.primegrid.com/download/GFN-2676404_262144.pdf).
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More... (http://www.primegrid.com/forum_thread.php?id=7361)