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
2486567Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
856562615499405531756.2old
ECM
DigitsB1Curves
2550000182 / 280
Estimated T-Level: 23.3
TF below 2^72 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-14Oliver KruseD9C8DECCF370AD5115110053
Verified2017-11-29ATHD9C8DECCF370AD511219573553
History
DateUserTypeResult
2022-08-18USAFSSNF-PM1
B1=224000, B2=203668920
2017-11-29ATHC-PRP
M2486567/85656261549940553 : D9C8DECCF370AD51
PRP: Verified
PRP without proof (not generated)
2017-10-14Oliver KruseC-PRP
M2486567/85656261549940553 : D9C8DECCF370AD51
PRP: Verified
PRP without proof (not generated)