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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
11261Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
4509532504346571548.7old
3992805132357882263998730812788.42008-08-29 02:24:27
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000004322 / 9201
Estimated T-Level: 42.3
TF below 2^136 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse52FC8BBD39FAA2DE2013
Verified2017-10-02kkmrkkblmbrbk52FC8BBD39FAA2DE2013
Verified2017-12-07ATH52FC8BBD39FAA2DE2778113
Verified2020-04-17Oliver Kruse301EAD312EF4501C2506053
Verified2024-07-01kkmrkkblmbrbk301EAD312EF4501C2624853
P-1 factors
DateFactorB1B2
2022-12-30399280513235788226399873081100000000000122192573512709696
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M11261/399280513235788226399873081/450953250434657 : 301EAD312EF4501C
PRP: Verified
PRP without proof (small exponent)
2022-12-30-Anonymous-F-PM1
Factor: 399280513235788226399873081 / (P-1, B1=100000000000, B2=122192573512709700)
2020-04-17Oliver KruseC-PRP
M11261/450953250434657/399280513235788226399873081 : 301EAD312EF4501C
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M11261/450953250434657/399280513235788226399873081 : 52FC8BBD39FAA2DE
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M11261/450953250434657/399280513235788226399873081 : 52FC8BBD39FAA2DE
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M11261/450953250434657/399280513235788226399873081 : 52FC8BBD39FAA2DE
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M11261/450953250434657/399280513235788226399873081 : 52FC8BBD39FAA2DE
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12
2008-08-29-Anonymous-F-ECM
Factor: 399280513235788226399873081