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

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MnStatusDetails
1981621Factored
FactorDigitsBitsDate
91019204460439668980172272.92018-02-15 13:14:30
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Thomas HonoldBB5C651CF3ABA42A0
Verified (Factored)1999-01-17Barry GoldsteinBB5C651CF3ABA42A859475
Verified (Factored)2015-06-28MadPooBB5C651CF3ABA42A1879718
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2018-02-17AdolfNor86097C94D7C8096C117674253
Verified2018-02-17Daniil Tsarkov86097C94D7C8096C112495153
P-1 factors
DateFactorB1B2
2018-02-159101920446043966898017198162160000000
History
DateUserTypeResult
2018-02-17Daniil TsarkovC-PRP
M1981621/9101920446043966898017 : 86097C94D7C8096C
PRP: Verified
PRP without proof (not generated)
2018-02-17AdolfNorC-PRP
M1981621/9101920446043966898017 : 86097C94D7C8096C
PRP: Verified
PRP without proof (not generated)
2018-02-15JossF-PM1
Factor: 9101920446043966898017 / (P-1, B1=1981621, B2=60000000, E=12)
2018-02-12TJAOINF
no factor from 2^66 to 2^67
2018-01-24JossNF-PM1
B1=1981621, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-09-11ramgeisNF
no factor from 2^65 to 2^66
2015-06-28MadPooC-LL
BB5C651CF3ABA42A
2015-03-15lycornNF
no factor from 2^64 to 2^65
2015-03-15lycornNF
no factor from 2^63 to 2^64
2011-07-01GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-01-27kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2009-12-19S485122NF
no factor from 2^60 to 2^61