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

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MnStatusDetails
7978781Factored
FactorDigitsBitsDate
397230862896924868792414005259703089737121.62022-07-31 23:56:45
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1999-09-07Ivan Clarke68236FFB306432A85809556
Verified (Factored)2002-07-06Radu Muschevici68236FFB306432A86520959
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-08-06Poao59AB7F72437CA937161841553
P-1 factors
DateFactorB1B2
2022-07-3139723086289692486879241400525970308971000000354388650
History
DateUserTypeResult
2022-08-07ANONYMOUSCERT
PRP Certification
Proof certified good
2022-08-06PoaoC-PRP
M7978781/3972308628969248687924140052597030897 : 59AB7F72437CA937
PRP proof power = 8
PRP: Verified
Proof certified good
2022-07-31USAFSSF-PM1
Factor: 3972308628969248687924140052597030897 / (P-1, B1=1000000, B2=354388650)
2021-12-11mikrNF
no factor from 2^70 to 2^71
2020-09-26-Anonymous-NF
no factor from 2^69 to 2^70
2020-02-21TJAOINF
no factor from 2^68 to 2^69
2018-07-24ramgeisNF
no factor from 2^67 to 2^68
2016-08-21Gordon SpenceNF
no factor from 2^66 to 2^67
2015-06-09VictordeHollanderNF
no factor from 2^65 to 2^66
2013-12-22David CampeauNF
no factor from 2^64 to 2^65
2013-10-02NesowaNF
no factor from 2^63 to 2^64
2012-06-26firejugglerNF-PM1
B1=100000, B2=1950000, E=6