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
2854517Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
210035360871134.3old
ECM
DigitsB1Curves
255000081 / 280
Estimated T-Level: 21.4
TF below 2^66 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-22Oliver Kruse86423F52BCA3E84E1264295653
Verified2017-12-07kkmrkkblmbrbk86423F52BCA3E84E1222883053
History
DateUserTypeResult
2022-11-18USAFSSNF-PM1
B1=255000, B2=203416290
2017-12-07kkmrkkblmbrbkC-PRP
M2854517/21003536087 : 86423F52BCA3E84E
PRP: Verified
PRP without proof (not generated)
2017-10-22Oliver KruseC-PRP
M2854517/21003536087 : 86423F52BCA3E84E
PRP: Verified
PRP without proof (not generated)