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M49

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M49 normally refers to the 49th Mersenne prime, in order of size from the smallest to greatest. This is the primary usage and what is referred to in the rest of this article. For clarification about other possible usages refer to the Nomenclature and notation article.

Discovery

The official discovery date for [math]\displaystyle{ 2^{74,207,281}{-}1 }[/math] was 7 January 2016. See the press release for the full description of this discovery.

The official credit for the discovery goes to "C. Cooper, G. Woltman, S. Kurowski, A. Blosser, et al."

Verification

To confirm that there were no errors in the hardware or software, the number had to be independently verified by running tests on various machines with different architecture and software.

The volunteers that ran these tests were:

  • Andreas Höglund and David Stanfill, who each ran the CUDALucas software on NVidia Titan Black GPUs in 2.3 days
  • David Stanfill, who ran clLucas on an AMD Fury X GPU in 3.5 days
  • Serge Batalov, who used Ernst Mayer's Mlucas software on two Intel Xeon 18-core Amazon EC2 servers in 3.5 days

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