PrimeGrid Yet Another GFN-131072 Mega Prime!

[Newshound]

On 4 June 2017, 04:02:39 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:

46413358^131072+1

The prime is 1,004,883 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 23rd for Generalized Fermat primes and 235th overall.

The discovery was made by Sagi Iltus (sagiil) using an Intel(R) Xeon(R) E5-2673 v3 CPU at 2.40GHz with 8GB RAM, running Linux. This CPU took about 7 hours 4 minutes to probable prime (PRP) test with Genefer.

The prime was verified on 7 June 2017, 18:18:37 UTC by Dirk Broer (Dirk Broer) of the British Virgin Islands using an AMD Athlon(TM) 5350 APU with 16GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 4 hours 1 minute to probable prime (PRP) test with GeneferOCL2. Dirk is a member of the AMD Users team.

The PRP was confirmed prime by an Intel(R) Xeon (R) E5-2670 CPU CPU @ 2.60GHz with 32GB RAM, running Linux. This computer took about 15 hours 21 minutes to complete the primality test using LLR.

For more details, please see the official announcement.


http://www.primegrid.com/forum_thread.php?id=7484