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
12253Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
12129667451499126071960.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001252 / 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 KruseA31F48934A1D0CBF1013
Verified2017-10-12kkmrkkblmbrbkA31F48934A1D0CBF1610113
Verified2020-04-17Oliver Kruse57FF64CE040821731245453
Verified2024-07-01kkmrkkblmbrbk57FF64CE040821731312353
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12253/1212966745149912607 : 57FF64CE04082173
PRP: Verified
PRP without proof (small exponent)
2023-04-06-Anonymous-NF-PM1
B1=100000000000, B2=120447384588771240
2020-04-17Oliver KruseC-PRP
M12253/1212966745149912607 : 57FF64CE04082173
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M12253/1212966745149912607 : A31F48934A1D0CBF
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12253/1212966745149912607 : A31F48934A1D0CBF
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12253/1212966745149912607 : A31F48934A1D0CBF
PRP without proof (not generated)
2016-09-09kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12