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
2207873Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
13247239823.7old
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
Verified2017-10-10Oliver Kruse95DD24C4A07889A01013
Verified2017-11-20kkmrkkblmbrbk95DD24C4A07889A0148407413
History
DateUserTypeResult
2017-11-20kkmrkkblmbrbkC-PRP
M2207873/13247239 : 95DD24C4A07889A0
PRP: Verified
PRP without proof (not generated)
2017-10-10Oliver KruseC-PRP
M2207873/13247239 : 95DD24C4A07889A0
PRP: Verified
PRP without proof (not generated)
2016-04-15alpertronNF-PM1
B1=500000, B2=15000000, E=12