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
1081981Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
86190606471033.0old
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)2025-09-01KrieselC8FB30FC4C570D2E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-28Oliver KruseA617E9DF71707EA61013
Verified2017-10-16Oliver KruseA617E9DF71707EA6156470613
Verified2018-01-02ATHA617E9DF71707EA6181242213
History
DateUserTypeResult
2025-09-01Architects CubedCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
C8FB30FC4C570D2E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2024-08-21cramsey87NF-PM1
B1=3000000, B2=26869402560
2018-01-02ATHC-PRP
M1081981/8619060647 : A617E9DF71707EA6
PRP: Verified
PRP without proof (not generated)
2017-10-16Oliver KruseC-PRP
M1081981/8619060647 : A617E9DF71707EA6
PRP: Verified
PRP without proof (not generated)
2017-09-28Oliver KruseC-PRP
M1081981/8619060647 : A617E9DF71707EA6
PRP: Verified
PRP without proof (not generated)