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
2528717Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
15172303823.9old
ECM
DigitsB1Curves
255000084 / 280
Estimated T-Level: 21.5
TF below 2^66 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-15kkmrkkblmbrbk63470F61C2BCB5411207186653
Verified2017-11-08Oliver Kruse63470F61C2BCB5411150386553
History
DateUserTypeResult
2022-08-23USAFSSNF-PM1
B1=300000, B2=259451010
2017-11-08Oliver KruseC-PRP
M2528717/15172303 : 63470F61C2BCB541
PRP: Verified
PRP without proof (not generated)
2017-10-15kkmrkkblmbrbkC-PRP
M2528717/15172303 : 63470F61C2BCB541
PRP: Verified
PRP without proof (not generated)