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

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MnStatusDetails
7987921Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
10393584739975476667617854074313014751339126.32023-08-01 20:12:39
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)1999-11-17Stephan GruppE77E3C950E4E680A758012
Verified (Factored)2002-10-12Sigmund GassnerE77E3C950E4E680A5868746
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-08-02Naegi Makoto458217A6F2E995FB1444851053
P-1 factors
DateFactorB1B2
2023-08-0110393584739975476667617854074313014751330000008070112050
History
DateUserTypeResult
2023-08-02Steve JacobsonCERT
PRP Certification
Proof certified good
2023-08-02Naegi MakotoC-PRP
M7987921/103935847399754766676178540743130147513 : 458217A6F2E995FB
PRP proof power = 8
PRP: Verified
Proof certified good
2023-08-01ThaF-PM1
Factor: 103935847399754766676178540743130147513 / (P-1, B1=3000000, B2=8070112050)
2023-07-24krackerNF
no factor from 2^71 to 2^72
2022-08-29Wentao HuangNF-PM1
B1=990000, B2=350223720
2021-12-13mikrNF
no factor from 2^70 to 2^71
2020-09-26-Anonymous-NF
no factor from 2^69 to 2^70
2020-02-14TJAOINF
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