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
1085327Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
274891622571134.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 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)2025-09-01KrieselF15C14B028536467013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-29Oliver KruseFF764B1FDB52E0611013
Verified2017-10-18kkmrkkblmbrbkFF764B1FDB52E061153870413
History
DateUserTypeResult
2025-09-01AlexeviCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
F15C14B028536467
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2024-10-04timc995NF-PM1
B1=2000000, B2=63130867800
2017-10-18kkmrkkblmbrbkC-PRP
M1085327/27489162257 : FF764B1FDB52E061
PRP: Verified
PRP without proof (not generated)
2017-09-29Oliver KruseC-PRP
M1085327/27489162257 : FF764B1FDB52E061
PRP: Verified
PRP without proof (not generated)