Marin Mersenne 2^P-1
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MnStatusDetails
3981889Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
122991884097168594072063.42009-11-11 06:54:20
ECM
DigitsB1Curves
25500001 / 280
Estimated T-Level: 20.0 ⓘ
TF below 2^61 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Tom CarneyF110E0AAB22969D40
Verified (Factored)1999-09-14Kerry ForesterF110E0AAB22969D4850448
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbk91F405975FF6EB9A1013
Verified2018-01-04Oliver Kruse91F405975FF6EB9A1240626613
History
DateUserTypeResult
2022-06-20LordJuliusNF
no factor from 2^66 to 2^67
2022-06-20LordJuliusNF
no factor from 2^65 to 2^66
2022-06-20LordJuliusNF
no factor from 2^64 to 2^65
2022-06-20LordJuliusNF
no factor from 2^61 to 2^63
2022-03-17JossNF-PM1
B1=1000000, B2=129198300
2022-01-27JossNF
no factor from 2^67 to 2^68
2020-09-02JossNF-PM1
B1=636000, B2=7963778, E=6
2018-01-04Oliver KruseC-PRP
M3981889/12299188409716859407 : 91F405975FF6EB9A
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3981889/12299188409716859407 : 91F405975FF6EB9A
PRP: Verified
PRP without proof (not generated)
2009-11-11James HintzF-ECM
Factor: 12299188409716859407
2009-07-27Carsten KossendeyNF-PM1
B1=20000, B2=290000