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07-05-17, 10:18 AM
On 30 June 2017, 02:54:43 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime: 3060772^262144+1 (http://primes.utm.edu/primes/page.php?id=123617) The prime is 1,700,222 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 5th for Generalized Fermat primes and 50th overall. The discovery was made by Sean Humphries (No.15 (https://www.primegrid.com/show_user.php?userid=449361)) of the United States using an NVIDIA GeForce GTX 1080 in an Intel(R) Xeon(R) E5-2670 CPU at 2.60GHz with 32GB RAM, running Linux. This GPU took about 16 minutes to probable prime (PRP) test with GeneferOCL3. Sean is a member of the Overclock.net (http://www.primegrid.com/team_display.php?teamid=2353) team. The prime was verified on 1 July 2017, 18:49:46 UTC by John Hall (JH30895 (https://www.primegrid.com/show_user.php?userid=53449)) of the United States using an NVIDIA GeForce GTX 680 in a dual Intel(R) Xeon(R) X5680 CPU @ 3.33 GHz with 24GB RAM, running macOS Sierra. This GPU took about 52 minutes to probable prime (PRP) test with GeneferOCL5. John is a member of the Ars Technica (http://www.primegrid.com/team_display.php?teamid=182) 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 4 hours 18 minutes to complete the primality test using LLR. For more details, please see the official announcement (http://www.primegrid.com/download/GFN-3060772_262144.pdf).
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More... (http://www.primegrid.com/forum_thread.php?id=7517)