Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
12391Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
198257617.6old
54049543825.72008-08-26 19:58:36
126036392274921758902542795182331100.02009-07-10 05:47:49
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 KruseEA18A7FEF03C887D3013
Verified2017-10-02kkmrkkblmbrbkEA18A7FEF03C887D3013
Verified2017-12-07ATHEA18A7FEF03C887D385413
Verified2020-04-17Oliver Kruse97A4BB84D5BC79DC3128353
Verified2024-07-01kkmrkkblmbrbk97A4BB84D5BC79DC3711353
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12391/1260363922749217589025427951823/198257/54049543 : 97A4BB84D5BC79DC
PRP: Verified
PRP without proof (small exponent)
2023-05-13-Anonymous-NF-PM1
B1=100000000000, B2=120417199046794650
2020-04-17Oliver KruseC-PRP
M12391/198257/54049543/1260363922749217589025427951823 : 97A4BB84D5BC79DC
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M12391/198257/54049543/1260363922749217589025427951823 : EA18A7FEF03C887D
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M12391/198257/54049543/1260363922749217589025427951823 : EA18A7FEF03C887D
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12391/198257/54049543/1260363922749217589025427951823 : EA18A7FEF03C887D
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12391/198257/54049543/1260363922749217589025427951823 : EA18A7FEF03C887D
PRP without proof (not generated)
2016-09-09kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12
2009-07-10Rob_DeeF-ECM
Factor: 1260363922749217589025427951823
2008-08-26-Anonymous-F
Factor: 54049543