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
1825867Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
105900287926.7old
511242761928.92008-07-15 07:47:05
4035640795431238.62008-07-15 07:47:05
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 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)2025-09-02Kriesel8A48EE29AE79120A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver Kruse5B512AB2956B2A103013
Verified2017-11-06kkmrkkblmbrbk5B512AB2956B2A103114036513
History
DateUserTypeResult
2025-09-03Oliver KruseCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
8A48EE29AE79120A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-06kkmrkkblmbrbkC-PRP
M1825867/105900287/403564079543/511242761 : 5B512AB2956B2A10
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1825867/105900287/403564079543/511242761 : 5B512AB2956B2A10
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 511242761
2008-07-15J FeitsmaF
Factor: 403564079543