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Andreas Hoglund and David Stanfill each verified the prime using the CUDALucas software running on NVidia Titan GPUs.

David Stanfill also verified using Cl Lucas on an AMD Fury GPU. Their first record prime was discovered in 2005, eclipsed by their second record in 2006. Cooper lost the record in 2008, but reclaimed it in 2013, and improved the record with this new prime.

GIMPS founder George Woltman, Prime Net creator Scott Kurowski, Primenet administrator Aaron Blosser, thank and congratulate all the GIMPS members that made this discovery possible.

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The prime number, also known as M74207281, is calculated by multiplying together 74,207,281 twos then subtracting one.

It has 22,338,618 digits -- almost 5 million digits longer than the previous record prime number.

Volunteers download a free program to search for these primes with a cash award offered to anyone lucky enough to find a new prime. Chris Caldwell maintains an authoritative web site on the largest known primes as well an excellent history of Mersenne primes. Cooper's computer reported the prime to the server on September 17, 2015.

However, a bug prevented the email notification from being sent.

It bests the previous record prime, also discovered by GIMPS, by 910,807 digits. If every second you were to write five digits to an inch then 54 days later you'd have a number stretching over 73 miles (118 km) -- almost 3 miles (5 km) longer than the previous record prime.