Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
3865481Factored
FactorDigitsBitsDate
2200780423518898615861692477.52021-03-22 07:09:08
42615375683138120995580054703041992899139128.32021-03-22 07:09:08
ECM
DigitsB1Curves
255000012 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Twomey3D9FD6B210B784350
Bad1999-12-15chris clark0D5CF68A87010E7B590643
Verified (Factored)2001-01-08David Willmore3D9FD6B210B784353805799
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-03-22XZT7A0E543A102767FE237359653
P-1 factors
DateFactorB1B2
2021-03-2242615375683138120995580054703041992899115000000750000000
2021-03-2222007804235188986158616915000000750000000
History
DateUserTypeResult
2022-07-17JossNF-PM1
B1=3865481, B2=3891751500
2022-02-15JossNF-PM1
B1=1000000, B2=134904000
2021-03-23curtiscCERT
PRP Certification
Proof certified good
2021-03-22XZTC-PRP
M3865481/426153756831381209955800547030419928991/220078042351889861586169 : 7A0E543A102767FE
PRP proof power = 7
PRP: Verified
Proof certified good
2021-03-22axnF-PM1
Factor: 93787084544353687348484146830436095506958398058547079607725479 / (P-1, B1=15000000, B2=750000000)
2020-11-23Carlos PinhoNF-PM1
B1=174000, B2=4699000, E=6
2020-10-05TJAOINF
no factor from 2^68 to 2^69
2019-01-25YxinityNF
no factor from 2^67 to 2^68
2016-11-25Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-28ramgeisNF
no factor from 2^65 to 2^66
2016-02-27JossNF-PM1
B1=229996, B2=2299960, E=6
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-01-14VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-14VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-22JossNF-PM1
B1=86604
2012-02-29GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-10-19Squeeky_SquirrelNF-PM1
B1=70000, B2=1137500, E=6
2011-02-19markrNF
no factor from 2^61 to 2^62
2009-02-25S485122NF
no factor from 2^60 to 2^61