Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
3156371Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
266460839831134.6old
ECM
DigitsB1Curves
255000052 / 280
Estimated T-Level: 20.9 ⓘ
TF below 2^65 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-31Oliver KruseF29C4CA45875019F1256913153
Verified2017-12-13Chang Chia-TcheF29C4CA45875019F1237189653
History
DateUserTypeResult
2022-03-24LordJuliusNF
no factor from 2^66 to 2^67
2022-03-24LordJuliusNF
no factor from 2^65 to 2^66
2022-03-24LordJuliusNF
no factor from 2^64 to 2^65
2022-03-24LordJuliusNF
no factor from 2^63 to 2^64
2022-03-24LordJuliusNF
no factor from 2^62 to 2^63
2022-02-13JossNF-PM1
B1=1000000, B2=119912100
2021-05-23JossNF
no factor from 2^67 to 2^68
2021-01-10JossNF
no factor from 2^64 to 2^65
2021-01-07JossNF
no factor from 2^63 to 2^64
2021-01-05JossNF
no factor from 2^62 to 2^63
2021-01-04JossNF
no factor from 2^61 to 2^62
2021-01-04JossNF
no factor from 2^60 to 2^61
2021-01-04JossNF-PM1
B1=315637, B2=3156371, E=6
2021-01-04JossNF
no factor from 2^59 to 2^60
2021-01-04JossNF-PM1
B1=315637
2017-12-13Chang Chia-TcheC-PRP
M3156371/26646083983 : F29C4CA45875019F
PRP: Verified
PRP without proof (not generated)
2017-10-31Oliver KruseC-PRP
M3156371/26646083983 : F29C4CA45875019F
PRP: Verified
PRP without proof (not generated)