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
1081901Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
476036441928.8old
605864561929.22008-07-16 09:31:06
ECM
DigitsB1Curves
2550000280 / 280
30250000104 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-01KrieselFCBD09536FC46A85013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-28Oliver KruseF8CDD6029CEA01472013
Verified2017-10-16Oliver KruseF8CDD6029CEA01472100231613
Verified2018-01-02ATHF8CDD6029CEA0147254373813
History
DateUserTypeResult
2025-09-01Zhang BingbingCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
FCBD09536FC46A85
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2024-08-22cramsey87NF-PM1
B1=3000000, B2=22221719520
2018-01-02ATHC-PRP
M1081901/476036441/605864561 : F8CDD6029CEA0147
PRP: Verified
PRP without proof (not generated)
2017-10-16Oliver KruseC-PRP
M1081901/476036441/605864561 : F8CDD6029CEA0147
PRP: Verified
PRP without proof (not generated)
2017-09-28Oliver KruseC-PRP
M1081901/476036441/605864561 : F8CDD6029CEA0147
PRP: Verified
PRP without proof (not generated)
2008-07-16J FeitsmaF
Factor: 605864561