Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
2257721
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 268
TF target 262
Factored
FactorDigitsBitsDate
619171133983691445.8old
ECM
DigitsB1Curves
2550000280 / 280
30250000163 / 640
Estimated T-Level: 26.3 ⓘ
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2017-10-10Oliver KruseC7962BC61723B4BB1013
Verified
PRP without proof (not generated)
2017-11-21storm5510C7962BC61723B4BB1174797513
History
DateUserTypeResult
2017-11-21storm5510C-PRPM2257721/61917113398369 : C7962BC61723B4BB
2017-10-10Oliver KruseC-PRPM2257721/61917113398369 : C7962BC61723B4BB
2016-04-12alpertronNF-PM1B1=500000, B2=15000000, E=12