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

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MnStatusDetails
2209421Factored
FactorDigitsBitsDate
2506871116247156386232392477.72020-04-26 03:48:09
ECM
DigitsB1Curves
255000067 / 280
Estimated T-Level: 21.2 ⓘ
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ben Byer3C1CE517F4E9C7A10
Verified (Factored)1999-05-09Jörg Thomsen3C1CE517F4E9C7A11824739
Verified (Factored)2018-04-17kkmrkkblmbrbk3C1CE517F4E9C7A1754563
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-04-26M MillerF81DA8D950A59ED61144188453
Verified2020-04-28Luigi MorelliF81DA8D950A59ED6150449153
History
DateUserTypeResult
2020-04-28Luigi MorelliC-PRP
M2209421/250687111624715638623239 : F81DA8D950A59ED6
PRP: Verified
PRP without proof (not generated)
2020-04-26M MillerC-PRP
M2209421/250687111624715638623239 : F81DA8D950A59ED6
PRP: Verified
PRP without proof (not generated)
2020-04-26mnd9F-ECM
Factor: 250687111624715638623239 / (ECM curve 1, B1=50000, B2=5000000, Sigma=5376048379017896)
2019-12-28mikrNF-PM1
B1=5000000, B2=200000000, E=12
2019-05-06TJAOINF
no factor from 2^67 to 2^68
2018-04-17kkmrkkblmbrbkC-LL
3C1CE517F4E9C7A1
2016-12-12Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-12-09Alexander DubrovinNF-PM1
B1=2000000, B2=65000000, E=12
2015-12-08Alexander DubrovinNF-PM1
B1=2000000, B2=15000000, E=12
2015-11-11Alexander DubrovinNF-PM1
B1=1000000, B2=2500000, E=6
2015-10-22ramgeisNF
no factor from 2^65 to 2^66
2015-03-06VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-06VictordeHollanderNF
no factor from 2^63 to 2^64
2013-12-04LaurVNF
no factor from 2^62 to 2^63
2012-01-07Squeeky_SquirrelNF-PM1
B1=135000, B2=2733750, E=6
2011-01-16JossNF-PM1
B1=50000
2009-01-08Sturle SundeNF
no factor from 2^61 to 2^62
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61