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Thread: PrimeGrid: GFN-1048576 Mega Prime!

  1. #1
    Platinum Member
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    October 24th, 2010

    PrimeGrid: GFN-1048576 Mega Prime!

    On 31 October 2018, 00:42:47 UTC, PrimeGridís Generalized Fermat Prime Search found the Generalized Fermat mega prime: 1059094^1048576+1 The prime is 6,317,602 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat primes and 13th overall. This is the second-largest prime found by PrimeGrid, and the second-largest non-Mersenne prime. The discovery was made by Rob Gahan (Robish) of Ireland using a Nvidia GeForce GTX 1080 in an Intel(R) Core(TM) i7-7820HK CPU at 2.90GHz with 32GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 3 hours 35 minutes to probable prime (PRP) test with GeneferOCL4. Rob is a member of the Storm 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 Edition. This computer took about 4 days, 5 hours, 54 minutes to complete the primality test using multithreaded LLR. For more details, please see the official announcement.


  2. #2
    Platinum Member
    Mumps's Avatar
    Join Date
    October 28th, 2010
    Milwaukee, WI

    Re: PrimeGrid: GFN-1048576 Mega Prime!

    3 1/2 hours on a GPU versus over 4 days on even a decent CPU. Says a lot, doesn't it...

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