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
2181379Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
52353097825.6old
ECM
DigitsB1Curves
2550000280 / 280
30250000164 / 640
Estimated T-Level: 26.3
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-11kkmrkkblmbrbk049BAB31B1C5AD2C1013
Verified2017-10-24Oliver Kruse049BAB31B1C5AD2C111567413
History
DateUserTypeResult
2017-10-24Oliver KruseC-PRP
M2181379/52353097 : 049BAB31B1C5AD2C
PRP: Verified
PRP without proof (not generated)
2017-10-11kkmrkkblmbrbkC-PRP
M2181379/52353097 : 049BAB31B1C5AD2C
PRP: Verified
PRP without proof (not generated)
2016-03-22alpertronNF-PM1
B1=500000, B2=15000000, E=12