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

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MnStatusDetails
12263Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
24527514.6old
6260978855870383286451855165954216735115.62010-04-04 17:10:20
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001251 / 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 KruseA7C45326CF4BDDB32013
Verified2017-10-02kkmrkkblmbrbkA7C45326CF4BDDB32013
Verified2017-12-07ATHA7C45326CF4BDDB32969113
Verified2020-04-17Oliver KruseA95DFD1DF19378DF2246753
Verified (Factored)2022-05-12Jorge CoveiroA95DFD1DF19378DF1861253
Verified2024-07-01kkmrkkblmbrbkA95DFD1DF19378DF251953
P-1 factors
DateFactorB1B2
2023-04-0662609788558703832864518551659542167100000000000120447384588771232
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12263/24527/62609788558703832864518551659542167 : A95DFD1DF19378DF
PRP: Verified
PRP without proof (small exponent)
2023-04-06-Anonymous-F-PM1
Factor: 62609788558703832864518551659542167 / (P-1, B1=100000000000, B2=120447384588771240)
2022-05-12Jorge CoveiroC-PRP
M12263/24527 : A95DFD1DF19378DF
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M12263/24527/62609788558703832864518551659542167 : A95DFD1DF19378DF
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M12263/24527/62609788558703832864518551659542167 : A7C45326CF4BDDB3
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M12263/24527/62609788558703832864518551659542167 : A7C45326CF4BDDB3
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12263/24527/62609788558703832864518551659542167 : A7C45326CF4BDDB3
PRP without proof (not generated)
2016-09-09kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12
2010-04-04James HintzF-ECM
Factor: 62609788558703832864518551659542167