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
1715243Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
3430487721.7old
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)2025-09-02KrieselBC6AA44CEF62D78A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron839809DAB98FEFDB1013
Verified2017-10-19Oliver Kruse839809DAB98FEFDB1138199213
History
DateUserTypeResult
2025-09-03jkaluzaCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
BC6AA44CEF62D78A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-19Oliver KruseC-PRP
M1715243/3430487 : 839809DAB98FEFDB
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1715243/3430487 : 839809DAB98FEFDB
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12