Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
12917Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
249240660749737698988973410228207524137120.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001390 / 9201
Estimated T-Level: 40.8
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseEA2BAE271B6BCD3F1013
Verified2017-10-12kkmrkkblmbrbkEA2BAE271B6BCD3F1370413
Verified2020-04-17Oliver Kruse40C0CCC85AF0E3C2138953
Verified2024-07-01kkmrkkblmbrbk40C0CCC85AF0E3C21246853
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12917/2492406607497376989889734102282075241 : 40C0CCC85AF0E3C2
PRP: Verified
PRP without proof (small exponent)
2023-10-10Anton RepkoNF-PM1
B1=100000000000, B2=122154521813133810
2023-05-15JacobZNF-PM1
B1=8600000000, B2=36024966470342850
2020-04-17Oliver KruseC-PRP
M12917/2492406607497376989889734102282075241 : 40C0CCC85AF0E3C2
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
PRP without proof (not generated)