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
1984901Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
14886757511030.5old
38705569511031.82008-07-15 07:48:59
401585170331135.22008-07-15 07:49:00
38739695915700929737664303251972133108.32022-09-05 10:34:22
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.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselCDA393E1C4D0181A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-05Oliver Kruse38B0C2865D15999C3013
Verified (Factored)2017-11-12ATH38B0C2865D15999C3166142013
Verified2022-09-12PerigCDA393E1C4D0181A4173097653
Verified2022-09-12seatseaCDA393E1C4D0181A4120299153
History
DateUserTypeResult
2025-09-03Chun sung sooCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
CDA393E1C4D0181A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2025-08-01USAFSSNF-PM1
B1=1680000, B2=8377365150
2022-09-12Nickson QueirozCERT
PRP Certification
Proof certified good
2022-09-12seatseaC-PRP
M1984901/1488675751/3870556951/40158517033/387396959157009297376643032519721 : CDA393E1C4D0181A
PRP proof power = 7
PRP: Verified
Proof certified good
2022-09-12R. ForsénCERT
PRP Certification
Proof certified good
2022-09-12PerigC-PRP
M1984901/1488675751/3870556951/40158517033/387396959157009297376643032519721 : CDA393E1C4D0181A
PRP proof power = 7
PRP: Verified
Proof certified good
2022-09-05TJAOIF-ECM
Factor: 387396959157009297376643032519721 / (ECM curve 171, B1=50000, B2=7500000)
2022-08-14USAFSSNF-PM1
B1=132000, B2=134381520
2017-11-12ATHC-PRP
M1984901/1488675751/3870556951/40158517033 : 38B0C2865D15999C
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1984901/1488675751/3870556951/40158517033 : 38B0C2865D15999C
PRP: Verified (Factored)
PRP without proof (not generated)
2008-07-15J FeitsmaF
Factor: 40158517033
2008-07-15J FeitsmaF
Factor: 3870556951