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06-19-18, 11:28 AM
On 17 June 2018, 15:40:35 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:5205422^262144+1 (http://primes.utm.edu/primes/page.php?id=125388)The prime is 1,760,679 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 8th for Generalized Fermat primes and 60th overall.The discovery was made by Scott Brown (Scott Brown (https://www.primegrid.com/show_user.php?userid=1178)) of the United States using an NVidia GeForce GTX 1080 in an Intel(R) Xeon(R) E5-1650 v3 CPU @ 3.50GHz with 32GB RAM, running Windows 7 Enterprise Edition. This GPU took about 18 minutes to probable prime (PRP) test with GeneferOCL3. Scott is a member of the Aggie The Pew (http://www.primegrid.com/team_display.php?teamid=2280) team.The prime was verified on 17 June 2018, 16:44:04 UTC by Keith Reinhardt (Keith (https://www.primegrid.com/show_user.php?userid=284516)) of Canada using an NVidia GeForce GTX 1050 Ti in an Intel(R) Core(TM) i7-4790 CPU at 3.60GHz with 16GB RAM, running Windows 7 Professional Edition. This GPU took about 43 minutes to probable prime (PRP) test with GeneferOCL5. Keith is a member of the BOINC@Denmark (http://www.primegrid.com/team_display.php?teamid=294) team.The PRP was confirmed prime by an Intel(R) Xeon(R) E3-1240 v6 CPU @ 3.70GHz with 2GB RAM, running Linux. This computer took about 5 hours 50 minutes to complete the primality test using multithreaded LLR.For more details, please see the official announcement (http://www.primegrid.com/download/GFN-5205422_262144.pdf).
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More... (http://www.primegrid.com/forum_thread.php?id=8110)