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
2879551Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
253400489927.9old
99517282571033.22008-09-07 19:42:34
ECM
DigitsB1Curves
255000083 / 280
Estimated T-Level: 21.5
TF below 2^66 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-23Oliver Kruse8BB5E0DDC3CC56DA2137151753
Verified2017-12-08kkmrkkblmbrbk8BB5E0DDC3CC56DA2237912853
History
DateUserTypeResult
2022-11-27USAFSSNF-PM1
B1=255000, B2=196319970
2017-12-08kkmrkkblmbrbkC-PRP
M2879551/253400489/9951728257 : 8BB5E0DDC3CC56DA
PRP: Verified
PRP without proof (not generated)
2017-10-23Oliver KruseC-PRP
M2879551/253400489/9951728257 : 8BB5E0DDC3CC56DA
PRP: Verified
PRP without proof (not generated)
2008-09-07Will EdgingtonF
Factor: 9951728257