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
208557523Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
1723763821162253790172167.22015-10-15 18:55:15
History
DateUserTypeResult
2015-10-15demfloroF
Factor: 172376382116225379017 / TF: 66-68
2013-08-06sannerud.comNF
no factor from 2^65 to 2^66
2011-05-13Charles A. MorrisNF
no factor from 2^64 to 2^65