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
4443889Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
177755561927.4old
38508520129511341.82008-09-30 21:35:19
ECM
DigitsB1Curves
25500003 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbkF60B458E12DC37BA2013
Verified2018-02-13Oliver KruseF60B458E12DC37BA2225373113
History
DateUserTypeResult
2023-06-21USAFSSNF-PM1
B1=336000, B2=220317240
2018-02-13Oliver KruseC-PRP
M4443889/177755561/3850852012951 : F60B458E12DC37BA
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M4443889/177755561/3850852012951 : F60B458E12DC37BA
PRP: Verified
PRP without proof (not generated)
2008-09-30markrF
Factor: 3850852012951