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

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MnStatusDetails
1731511Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
20120157831030.9old
327220948791134.92008-07-15 07:45:53
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)2025-09-02Kriesel48623C2FD719FE0E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron8370F25D0E4F82792013
Verified2017-10-19Oliver Kruse8370F25D0E4F8279221305613
History
DateUserTypeResult
2025-09-03GnarwhalsCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
48623C2FD719FE0E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-19Oliver KruseC-PRP
M1731511/2012015783/32722094879 : 8370F25D0E4F8279
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1731511/2012015783/32722094879 : 8370F25D0E4F8279
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 32722094879