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
3942941Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
23973081291031.2old
ECM
DigitsB1Curves
25500003 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbkAF607BDDA64CF82F1013
Verified2017-12-31Oliver KruseAF607BDDA64CF82F188952113
History
DateUserTypeResult
2022-06-02JossNF-PM1
B1=100000, B2=119860650
2022-03-22JossNF-PM1
B1=100000
2022-03-02JossNF-PM1
B1=90000
2017-12-31Oliver KruseC-PRP
M3942941/2397308129 : AF607BDDA64CF82F
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3942941/2397308129 : AF607BDDA64CF82F
PRP: Verified
PRP without proof (not generated)