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

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MnStatusDetails
1791563Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3583127721.8old
419225743928.62008-07-15 07:46:41
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)2025-09-02Kriesel5C6F6C256F0828F5013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-03Oliver Kruse9647B9CAC5D9EDA22013
Verified2017-11-05kkmrkkblmbrbk9647B9CAC5D9EDA2210344213
History
DateUserTypeResult
2025-09-030xCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
5C6F6C256F0828F5
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-05kkmrkkblmbrbkC-PRP
M1791563/3583127/419225743 : 9647B9CAC5D9EDA2
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1791563/3583127/419225743 : 9647B9CAC5D9EDA2
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 419225743