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

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Exponent Range:










MnStatusDetails
2221523Factored
FactorDigitsBitsDate
20438870913701665573780717142380725635939127.32022-11-04 19:40:38
ECM
DigitsB1Curves
2550000280 / 280
30250000158 / 640
Estimated T-Level: 26.2
TF below 2^82 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jeff Gray6EF4940CDBFB05E10
Verified (Factored)1999-02-14James Arnold6EF4940CDBFB05E11794052
Verified (Factored)2018-04-19kkmrkkblmbrbk6EF4940CDBFB05E1639966
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2022-11-07LordJulius9A3A0B666A8FE0BA1221923453
P-1 factors
DateFactorB1B2
2022-11-042043887091370166557378071714238072563591000000005001157521360
History
DateUserTypeResult
2022-11-07Robert WalkerCERT
PRP Certification
Proof certified good
2022-11-07LordJuliusC-PRP
M2221523/204388709137016655737807171423807256359 : 9A3A0B666A8FE0BA
PRP proof power = 7
PRP: Verified
Proof certified good
2022-11-04LaurVF-PM1
Factor: 204388709137016655737807171423807256359 / (P-1, B1=100000000, B2=5001157521360)
2022-10-12LaurVNF-PM1
B1=100000000
2022-09-06LaurVNF
no factor from 2^71 to 2^72
2022-09-06LaurVNF
no factor from 2^70 to 2^71
2022-09-06LaurVNF
no factor from 2^69 to 2^70
2022-04-11LaurVNF-PM1
B1=57885161, B2=2100390512220
2022-03-17LaurVNF-PM1
B1=82589933
2022-02-16LaurVNF-PM1
B1=57885161, B2=579246627960
2022-02-05LaurVNF-PM1
B1=57885161
2022-01-26LaurVNF-PM1
B1=6972593, B2=112580788320
2022-01-24LaurVNF-PM1
B1=6972593
2021-08-19TJAOINF
no factor from 2^68 to 2^69
2019-04-22TJAOINF
no factor from 2^67 to 2^68
2018-04-19kkmrkkblmbrbkC-LL
6EF4940CDBFB05E1
2016-12-23Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-12-20Alexander DubrovinNF-PM1
B1=2000000, B2=65000000, E=12
2015-11-19Alexander DubrovinNF-PM1
B1=1000000, B2=10000000, E=6
2015-11-19Alexander DubrovinNF-PM1
B1=1000000, B2=5000000, E=6
2015-10-23ramgeisNF
no factor from 2^65 to 2^66
2015-05-01Squeeky_SquirrelNF-PM1
B1=160000, B2=4600000, E=6
2015-03-06VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-06VictordeHollanderNF
no factor from 2^63 to 2^64
2014-09-29JossNF-PM1
B1=142784
2014-05-26JossNF-PM1
B1=113892
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2012-04-19Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-02Oscar ÖstlinNF-PM1
B1=85000, B2=1593750, E=6
2010-10-13Oscar ÖstlinNF-PM1
B1=75011
2009-01-11Sturle SundeNF
no factor from 2^60 to 2^61