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

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MnStatusDetails
2561981Factored
FactorDigitsBitsDate
24275908708992388993692271.02015-08-13 03:41:15
ECM
DigitsB1Curves
255000015 / 280
Estimated T-Level: 20.3
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jari HällströmEAF7D46D4EF949FE0
Verified (Factored)1999-04-13Phillip TwissEAF7D46D4EF949FE2307151
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-15Oliver KruseEAB4C9B85385703A132120153
Verified2017-12-01kkmrkkblmbrbkEAB4C9B85385703A1239020453
History
DateUserTypeResult
2023-01-28USAFSSNF-PM1
B1=288000, B2=280212660
2022-03-11LordJuliusNF
no factor from 2^1 to 2^60
2017-12-01kkmrkkblmbrbkC-PRP
M2561981/2427590870899238899369 : EAB4C9B85385703A
PRP: Verified
PRP without proof (not generated)
2017-10-15Oliver KruseC-PRP
M2561981/2427590870899238899369 : EAB4C9B85385703A
PRP: Verified
PRP without proof (not generated)
2015-08-13guruF-ECM
Factor: 2427590870899238899369 / (ECM curve 3, B1=50000, B2=5000000)
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-17Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-04-12James HeinrichNF-PM1
B1=175000, B2=4068750, E=6
2011-01-10JossNF-PM1
B1=50000
2011-01-03JossNF-PM1
B1=30000
2010-12-21JossNF-PM1
B1=20000
2009-01-31Sturle SundeNF
no factor from 2^60 to 2^61