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
2956783Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
4920003976602276411858.8old
ECM
DigitsB1Curves
2550000105 / 280
Estimated T-Level: 21.9
TF below 2^68 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-26alpertron2D78C25FF59043491199269053
Verified2017-11-18Oliver Kruse2D78C25FF59043491255486153
History
DateUserTypeResult
2023-02-13USAFSSNF-PM1
B1=360000, B2=298405800
2017-11-18Oliver KruseC-PRP
M2956783/492000397660227641 : 2D78C25FF5904349
PRP: Verified
PRP without proof (not generated)
2017-10-26alpertronC-PRP
M2956783/492000397660227641 : 2D78C25FF5904349
PRP: Verified
PRP without proof (not generated)