Marin Mersenne 2^P-1
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MnStatusDetails
3261961Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
151203120092242773432063.72014-06-20 22:24:03
ECM
DigitsB1Curves
25500008 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-02-12Ross Presser517CF4C983A8698A0
Verified (Factored)2001-06-30D Nichols517CF4C983A8698A2270437
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-11-02Oliver KruseBF87AB404E1E31061243847953
Verified2017-12-13kkmrkkblmbrbkBF87AB404E1E3106144031253
History
DateUserTypeResult
2022-04-06LordJuliusNF
no factor from 2^66 to 2^67
2022-04-06LordJuliusNF
no factor from 2^65 to 2^66
2022-04-06LordJuliusNF
no factor from 2^64 to 2^65
2022-04-06LordJuliusNF
no factor from 2^62 to 2^63
2022-04-06LordJuliusNF
no factor from 2^1 to 2^62
2022-02-04JossNF-PM1
B1=1000000, B2=119912100
2021-04-15JossNF
no factor from 2^67 to 2^68
2021-01-18JossNF-PM1
B1=326196, B2=3261961, E=6
2020-12-25JossNF-PM1
B1=108732
2017-12-13kkmrkkblmbrbkC-PRP
M3261961/15120312009224277343 : BF87AB404E1E3106
PRP: Verified
PRP without proof (not generated)
2017-11-02Oliver KruseC-PRP
M3261961/15120312009224277343 : BF87AB404E1E3106
PRP: Verified
PRP without proof (not generated)
2014-06-20joe b.F-ECM
Factor: 15120312009224277343
2014-06-13JossNF-PM1
B1=79677
2012-12-30dbaughNF
no factor from 2^62 to 2^63
2011-10-03markrNF
no factor to 2^62
2011-09-15USAFSSNF-PM1
B1=60000, B2=1050000, E=6
2009-07-06Carsten KossendeyNF-PM1
B1=15000, B2=191250
2009-04-04S485122NF
no factor from 2^60 to 2^61