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
3999113Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
55987583825.7old
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
Verified2017-09-20kkmrkkblmbrbk875431E54DD467A61013
Verified2018-01-05Oliver Kruse875431E54DD467A6195541513
History
DateUserTypeResult
2022-06-02JossNF-PM1
B1=200000, B2=113097600
2022-02-25JossNF-PM1
B1=200000
2022-01-13JossNF
no factor from 2^67 to 2^68
2020-08-21JossNF-PM1
B1=399911, B2=3999113, E=6
2020-08-20JossNF-PM1
B1=399911
2018-01-05Oliver KruseC-PRP
M3999113/55987583 : 875431E54DD467A6
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3999113/55987583 : 875431E54DD467A6
PRP: Verified
PRP without proof (not generated)