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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
12889Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
203826647927.6old
14225602549158135890870633268179436136116.82012-08-18 23:00:18
66243648548022638327141704470737052838223436145148.92023-05-15 09:14:53
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001672 / 9201
Estimated T-Level: 40.9
TF below 2^131 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-21Oliver KruseA1836846BA0431B82013
Verified (Factored)2017-10-02kkmrkkblmbrbkA1836846BA0431B82013
Verified (Factored)2017-12-07ATHA1836846BA0431B82351613
Verified (Factored)2020-04-17Oliver KruseF4185ACB3F3F6CE12401453
Verified2023-05-15JacobZF4185ACB3F3F6CE13424453
Verified2023-05-15retsuF4185ACB3F3F6CE13290053
P-1 factors
DateFactorB1B2
2023-05-15662436485480226383271417044707370528382234361860000000036024966470342848
2023-05-27662436485480226383271417044707370528382234361100000000000120417199046794656
History
DateUserTypeResult
2023-05-27-Anonymous-F-PM1
Factor: 662436485480226383271417044707370528382234361 / (P-1, B1=100000000000, B2=120417199046794650)
2023-05-15retsuC-PRP
M12889/203826647/142256025491581358908706332681794361/662436485480226383271417044707370528382234361 : F4185ACB3F3F6CE1
PRP: Verified
PRP without proof (small exponent)
2023-05-15JacobZC-PRP
M12889/203826647/142256025491581358908706332681794361/662436485480226383271417044707370528382234361 : F4185ACB3F3F6CE1
PRP: Verified
PRP without proof (small exponent)
2023-05-15JacobZF-PM1
Factor: 662436485480226383271417044707370528382234361 / (P-1, B1=8600000000, B2=36024966470342850)
2022-02-05JossNF-PM1
B1=1000000, B2=3910366209750
2020-04-17Oliver KruseC-PRP
M12889/203826647/142256025491581358908706332681794361 : F4185ACB3F3F6CE1
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
PRP without proof (not generated)
2012-08-18BloodIceF-ECM
Factor: 142256025491581358908706332681794361