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
257202499Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
681728455433501554812065.92013-11-20 22:11:47
History
DateUserTypeResult
2013-11-20NickF
Factor: 68172845543350155481
2011-08-05carlos56NF
no factor from 2^64 to 2^65
2010-03-11RichardNF
no factor from 2^63 to 2^64
2010-03-11RichardNF
no factor from 2^62 to 2^63