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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Exponent Range:





MnDetails
2271821
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 268
TF target 262
Factored
FactorDigitsBitsDate
423421997991135.3old
ECM
DigitsB1Curves
2550000280 / 280
30250000192 / 640
Estimated T-Level: 26.5 ⓘ
TF below 2^83 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2017-10-11Oliver KruseCD7995D522A6D2AD1013
Verified
PRP without proof (not generated)
2017-11-21storm5510CD7995D522A6D2AD1205076213
History
DateUserTypeResult
2017-11-21storm5510C-PRPM2271821/42342199799 : CD7995D522A6D2AD
2017-10-11Oliver KruseC-PRPM2271821/42342199799 : CD7995D522A6D2AD
2016-04-29alpertronNF-PM1B1=500000, B2=15000000, E=12