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
2166763Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
19918965588491340.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000196 / 640
Estimated T-Level: 26.5
TF below 2^83 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-09kkmrkkblmbrbk169F44979DC8F3FE1013
Verified2017-10-21Oliver Kruse169F44979DC8F3FE1104312913
History
DateUserTypeResult
2017-10-21Oliver KruseC-PRP
M2166763/1991896558849 : 169F44979DC8F3FE
PRP: Verified
PRP without proof (not generated)
2017-10-09kkmrkkblmbrbkC-PRP
M2166763/1991896558849 : 169F44979DC8F3FE
PRP: Verified
PRP without proof (not generated)
2016-03-30alpertronNF-PM1
B1=500000, B2=15000000, E=12