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
4497721Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
2082173070697191547.6old
ECM
DigitsB1Curves
25500003 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbkA6A43281800986CB1013
Verified2018-02-18Oliver KruseA6A43281800986CB1230335113
History
DateUserTypeResult
2023-07-31USAFSSNF-PM1
B1=336000, B2=158258100
2018-02-18Oliver KruseC-PRP
M4497721/208217307069719 : A6A43281800986CB
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M4497721/208217307069719 : A6A43281800986CB
PRP: Verified
PRP without proof (not generated)