Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
221087879Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
1337831536275280643512166.92015-10-28 08:36:06
History
DateUserTypeResult
2015-10-28ConductorF
Factor: 133783153627528064351 / TF: 66-67
2013-08-25lindeeNF
no factor from 2^65 to 2^66
2011-06-06lindedNF
no factor from 2^64 to 2^65