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02-25-17, 11:43 AM
On 24 February 2017, 07:16:40 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:2514168^262144+1 (http://primes.utm.edu/primes/page.php?id=123051)The prime is 1,677,825 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 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 prime was verified on 24 February 2017, 12:21:21 UTC by Hans-Jürgen Bergelt (Hans-Jürgen Bergelt (https://www.primegrid.com/show_user.php?userid=139913)) of Germany using an NVIDIA GeForce GTX 690 in an Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz with 8GB RAM, running Microsoft Windows 10 Core Edition. This GPU took about 37 minutes to probable prime (PRP) test with GeneferOCL4. Hans-Jürgen is a member of the SETI.Germany (http://www.primegrid.com/team_display.php?teamid=11) 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 7 minutes to complete the primality test using LLR.For more details, please see the official announcement (http://www.primegrid.com/download/GFN-2514168_262144.pdf).
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More... (http://www.primegrid.com/forum_thread.php?id=7313)