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
2181469Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
56176772896532871652.3old
ECM
DigitsB1Curves
2550000280 / 280
30250000166 / 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
Verified2017-10-10kkmrkkblmbrbk3EA559EBBF36FB851013
Verified2017-10-24Oliver Kruse3EA559EBBF36FB85166270813
History
DateUserTypeResult
2017-10-24Oliver KruseC-PRP
M2181469/5617677289653287 : 3EA559EBBF36FB85
PRP: Verified
PRP without proof (not generated)
2017-10-10kkmrkkblmbrbkC-PRP
M2181469/5617677289653287 : 3EA559EBBF36FB85
PRP: Verified
PRP without proof (not generated)
2016-03-22alpertronNF-PM1
B1=500000, B2=15000000, E=12