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
1685483Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
3370967721.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)2025-09-02Kriesel8CB1A5E5309FB049013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-03Oliver Kruse546280D72E2302851013
Verified2017-11-03kkmrkkblmbrbk546280D72E23028519966713
History
DateUserTypeResult
2025-09-03takahashiCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
8CB1A5E5309FB049
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-03kkmrkkblmbrbkC-PRP
M1685483/3370967 : 546280D72E230285
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1685483/3370967 : 546280D72E230285
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12