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
4761947Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
123810623926.9old
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
Verified2017-09-20kkmrkkblmbrbk66876BD021A8D5371013
Verified2018-03-18MrSupp_CZ66876BD021A8D5371243059513
History
DateUserTypeResult
2023-10-08USAFSSNF-PM1
B1=240000, B2=91991760
2018-03-18MrSupp_CZC-PRP
M4761947/123810623 : 66876BD021A8D537
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M4761947/123810623 : 66876BD021A8D537
PRP: Verified
PRP without proof (not generated)