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
1724449Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
2581293219131237.9old
3313942621271238.32008-07-15 07:45:47
ECM
DigitsB1Curves
2550000280 / 280
30250000103 / 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)2025-09-02KrieselAB3DA36F8D73305E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron8478C137849F4F4F2013
Verified2017-10-19Oliver Kruse8478C137849F4F4F2151389013
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
AB3DA36F8D73305E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-19Oliver KruseC-PRP
M1724449/258129321913/331394262127 : 8478C137849F4F4F
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1724449/258129321913/331394262127 : 8478C137849F4F4F
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 331394262127