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

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MnStatusDetails
12671Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
25343514.6old
99847481826.62008-08-26 19:58:38
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 KruseA5F2512455D601B32013
Verified2017-10-12kkmrkkblmbrbkA5F2512455D601B32979013
Verified2020-04-17Oliver Kruse4B6584BA29DC97E521124853
Verified (Factored)2022-05-12Jorge Coveiro4B6584BA29DC97E51199753
Verified2024-07-01kkmrkkblmbrbk4B6584BA29DC97E52569953
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12671/25343/99847481 : 4B6584BA29DC97E5
PRP: Verified
PRP without proof (small exponent)
2023-05-22-Anonymous-NF-PM1
B1=100000000000, B2=120417199046794650
2022-05-12Jorge CoveiroC-PRP
M12671/25343 : 4B6584BA29DC97E5
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M12671/25343/99847481 : 4B6584BA29DC97E5
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M12671/25343/99847481 : A5F2512455D601B3
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12671/25343/99847481 : A5F2512455D601B3
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12671/25343/99847481 : A5F2512455D601B3
PRP without proof (not generated)
2008-08-26-Anonymous-F
Factor: 99847481