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

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MnStatusDetails
2355191Factored
FactorDigitsBitsDate
613557800626143085318198492685.72020-05-09 10:29:21
ECM
DigitsB1Curves
255000053 / 280
Estimated T-Level: 20.9 ⓘ
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Doug FortuneAD397FEE6370DF0D0
Verified (Factored)1999-03-15Jamie RiskAD397FEE6370DF0D1043494
Verified (Factored)2018-05-10kkmrkkblmbrbkAD397FEE6370DF0D1408201
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-05-09M Miller9852B355FB2CFD981696953
Verified2020-05-10marssystems9852B355FB2CFD981168795253
History
DateUserTypeResult
2020-05-10marssystemsC-PRP
M2355191/61355780062614308531819849 : 9852B355FB2CFD98
PRP: Verified
PRP without proof (not generated)
2020-05-09M MillerC-PRP
M2355191/61355780062614308531819849 : 9852B355FB2CFD98
PRP: Verified
PRP without proof (not generated)
2020-05-09mnd9F-ECM
Factor: 61355780062614308531819849 / (ECM curve 2, B1=50000, B2=5000000, Sigma=4569749552054395)
2019-04-29TJAOINF
no factor from 2^67 to 2^68
2018-05-10kkmrkkblmbrbkC-LL
AD397FEE6370DF0D
2017-06-10Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-10-28ramgeisNF
no factor from 2^65 to 2^66
2015-08-04mikrNF-PM1
B1=3000000, B2=100000000, E=12
2015-03-06VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-06VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-22JossNF-PM1
B1=144504
2014-08-07JossNF-PM1
B1=117252
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2012-05-29Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-23Oscar ÖstlinNF-PM1
B1=90000, B2=1822500, E=6
2010-12-04Oscar ÖstlinNF-PM1
B1=75011
2010-11-03JossNF-PM1
B1=20000
2009-01-15Sturle SundeNF
no factor from 2^60 to 2^61