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
6911987Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
55295897825.7old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2018-01-18Chang Chia-TcheE8C0144AA9ADC1951659100053
Verified2019-02-22kkmrkkblmbrbkE8C0144AA9ADC1951366183453
History
DateUserTypeResult
2023-12-27Stef42NF-PM1
B1=569000, B2=1280664000
2019-02-22kkmrkkblmbrbkC-PRP
M6911987/55295897 : E8C0144AA9ADC195
PRP: Verified
PRP without proof (not generated)
2018-01-18Chang Chia-TcheC-PRP
M6911987/55295897 : E8C0144AA9ADC195
PRP: Verified
PRP without proof (not generated)