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.
The official discovery date for 274,207,281-1 was 2016-01-07. See the press release for the full description of this discovery.
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
- Discovery thread at MersenneForum
- New World's Biggest Prime Number (PRINTED FULLY ON PAPER) at YouTube channel Numberphile
- More details about the World's Biggest Prime at YouTube channel Numberphile2