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03-28-18, 08:43 AM
On 20 March 2018, 08:28:32 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:2061748^524288+1 (https://primes.utm.edu/primes/page.php?id=124537)The prime is 3,310,478 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 2nd for Generalized Fermat primes and 22nd overall.The discovery was made by Cesare Marini (Cesare Marini (https://www.primegrid.com/show_user.php?userid=106571)) of Italy using an NVIDIA GeForce GTX 1060 in an Intel(R) Core(TM) i7-6700 CPU at 3.40GHz with 32GB RAM, running Windows 10 Professional Edition. This GPU took about 1 hour 32 minutes to probable prime (PRP) test with GeneferOCL5. The prime was verified on 20 March 2018, 19:46:06 UTC by Håkan Lind (sangis43 (https://www.primegrid.com/show_user.php?userid=152018)) of Sweden using an NVIDIA GeForce GTX 1070 in an Intel(R) Core(TM) i7-4930K CPU @ 3.40GHz with 16GB RAM, running Windows 7 Professional Edition. This GPU took about 1 hour 16 minutes to probable prime (PRP) test with GeneferOCL5. Håkan is a member of the Sicituradastra. (http://www.primegrid.com/team_display.php?teamid=1596) 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 21 hours 6 minutes to complete the primality test using LLR.For more details, please see the official announcement (http://www.primegrid.com/download/GFN-2061748_524288.pdf).
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More... (http://www.primegrid.com/forum_thread.php?id=7941)