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:










MnStatusDetails
1326889Factored
FactorDigitsBitsDate
412283845848247814857512375.12014-02-12 14:51:29
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ken KrieselC28C0CEF7DDDEA650
Verified (Factored)Cornelius CaesarC28C0CEF7DDDEA650
Verified (Factored)Brian J. BeesleyC28C0CEF7DDDEA65548451
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30Oliver Kruse4C485DDAD44974521013
Verified2017-10-23kkmrkkblmbrbk4C485DDAD4497452179156113
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2017-10-23kkmrkkblmbrbkC-PRP
M1326889/41228384584824781485751 : 4C485DDAD4497452
PRP: Verified
PRP without proof (not generated)
2017-09-30Oliver KruseC-PRP
M1326889/41228384584824781485751 : 4C485DDAD4497452
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2014-02-12OS1F-ECM
Factor: 41228384584824781485751
2013-09-29David CampeauNF-PM1
B1=3990000, B2=143640000, E=12
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-09-15AxelssonNF
no factor from 2^61 to 2^62
2009-02-20Sturle SundeNF
no factor from 2^60 to 2^61