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
1652243Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3304487721.7old
158615329927.22008-07-15 07:44:50
ECM
DigitsB1Curves
2550000280 / 280
30250000134 / 640
Estimated T-Level: 26.0
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel9EFD17BD048FEC1E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver KruseB99D149218DEDB702013
Verified2017-11-02ATHB99D149218DEDB7022221313
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
9EFD17BD048FEC1E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-02ATHC-PRP
M1652243/3304487/158615329 : B99D149218DEDB70
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1652243/3304487/158615329 : B99D149218DEDB70
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 158615329