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
12491Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
26006263824.6old
1762400157611237.42008-08-26 19:58:37
24982945568711341.22008-08-26 19:58:37
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001330 / 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 KruseB95671F4D9BD69C93013
Verified2017-10-12kkmrkkblmbrbkB95671F4D9BD69C93610413
Verified2020-04-17Oliver Kruse891FFF22BD5BF0C331146053
Verified2024-07-01kkmrkkblmbrbk891FFF22BD5BF0C33365453
History
DateUserTypeResult
2024-09-25-Anonymous-NF-PM1
B1=1000000000000, B2=1403084906657654220
2024-07-01kkmrkkblmbrbkC-PRP
M12491/176240015761/2498294556871/26006263 : 891FFF22BD5BF0C3
PRP: Verified
PRP without proof (small exponent)
2022-09-11BloodIceNF-PM1
B1=100000000000, B2=65542071839964720
2022-08-29BloodIceNF-PM1
B1=10000000000, B2=4099880487682980
2022-08-28BloodIceNF-PM1
B1=1000000000, B2=333483097867920
2022-08-28BloodIceNF-PM1
B1=100000000, B2=28207674615120
2020-04-17Oliver KruseC-PRP
M12491/26006263/176240015761/2498294556871 : 891FFF22BD5BF0C3
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12491/26006263/176240015761/2498294556871 : B95671F4D9BD69C9
PRP without proof (not generated)
2016-09-09kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12
2008-08-26-Anonymous-F
Factor: 2498294556871
2008-08-26-Anonymous-F
Factor: 176240015761