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

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MnStatusDetails
407291Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
385671993720011445.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000330 / 640
Estimated T-Level: 27.6
TF below 2^87 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-23Oliver KruseE64982D40FD4179A1013
Verified2017-11-02kkmrkkblmbrbkE64982D40FD4179A134827513
Verified2020-04-18Oliver Kruse263887AA2593814E13701353
Verified2024-10-21kkmrkkblmbrbk263887AA2593814E12395353
History
DateUserTypeResult
2024-10-21Carlos PinhoCERT
PRP Certification
Proof certified good
2024-10-21kkmrkkblmbrbkC-PRP
M407291/38567199372001 : 263887AA2593814E
PRP proof power = 5
PRP: Verified
Proof certified good
2020-04-18Oliver KruseC-PRP
M407291/38567199372001 : 263887AA2593814E
PRP: Verified
PRP without proof (small exponent)
2017-11-02kkmrkkblmbrbkC-PRP
M407291/38567199372001 : E64982D40FD4179A
PRP: Verified
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M407291/38567199372001 : E64982D40FD4179A
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=3000000, B2=100000000, E=12