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
12647Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
8599961723.0old
850485457929.72008-08-26 19:58:37
215786675376988331754.32008-08-26 19:58:37
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001267 / 9201
Estimated T-Level: 40.7
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 KruseB9B6A59925043EA43013
Verified2017-10-12kkmrkkblmbrbkB9B6A59925043EA43493213
Verified2020-04-17Oliver KruseADEDAE10BFC98DB531123153
Verified2024-07-01kkmrkkblmbrbkADEDAE10BFC98DB53337853
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12647/21578667537698833/850485457/8599961 : ADEDAE10BFC98DB5
PRP: Verified
PRP without proof (small exponent)
2023-05-13Anton RepkoNF-PM1
B1=100000000000, B2=120417199046794650
2022-02-05JossNF-PM1
B1=1000000, B2=3910366209750
2020-04-17Oliver KruseC-PRP
M12647/8599961/850485457/21578667537698833 : ADEDAE10BFC98DB5
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M12647/8599961/850485457/21578667537698833 : B9B6A59925043EA4
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12647/8599961/850485457/21578667537698833 : B9B6A59925043EA4
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12647/8599961/850485457/21578667537698833 : B9B6A59925043EA4
PRP without proof (not generated)
2008-08-26-Anonymous-F-PM1
Factor: 21578667537698833
2008-08-26-Anonymous-F
Factor: 850485457