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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Exponent Range:










MnStatusDetails
1843943Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
121700239926.9old
12943742282811340.22008-07-15 07:47:18
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)2025-09-02KrieselCBF3DCC3C59B077F013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver KruseA615E478678E9E582013
Verified2017-11-06ATHA615E478678E9E582137357113
History
DateUserTypeResult
2025-09-03JohnK Wright V Plano TexasCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
CBF3DCC3C59B077F
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-04-05JossNF-PM1
B1=1000000, B2=188329050
2017-11-06ATHC-PRP
M1843943/121700239/1294374228281 : A615E478678E9E58
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1843943/121700239/1294374228281 : A615E478678E9E58
PRP: Verified
PRP without proof (not generated)
2008-07-15J FeitsmaF
Factor: 1294374228281