Marin Mersenne 2^P-1
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MnStatusDetails
2207783Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
17428563980113737955992270.62015-12-07 05:25:10
ECM
DigitsB1Curves
2550000280 / 280
3025000061 / 640
Estimated T-Level: 25.5 ⓘ
TF below 2^80 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Filip VerberckmoesEF6DE3BAA83F5E220
Verified (Factored)1999-02-21Dennis WilliamsonEF6DE3BAA83F5E221744771
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-30alpertron58833B55D756F5DA1013
Verified2017-10-25Oliver Kruse58833B55D756F5DA1202394013
P-1 factors
DateFactorB1B2
2015-12-071742856398011373795599200000065000000
History
DateUserTypeResult
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-10-25Oliver KruseC-PRP
M2207783/1742856398011373795599 : 58833B55D756F5DA
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M2207783/1742856398011373795599 : 58833B55D756F5DA
PRP: Verified
PRP without proof (not generated)
2016-04-15alpertronNF-PM1
B1=500000, B2=15000000, E=12
2015-12-07Alexander DubrovinF-PM1
Factor: 1742856398011373795599 / (P-1, B1=2000000, B2=65000000, E=12)
2015-11-10Alexander DubrovinNF-PM1
B1=2000000, B2=8000000, E=12
2015-11-10Alexander DubrovinNF-PM1
B1=1500000, B2=5500000, E=6
2015-11-09Alexander DubrovinNF-PM1
B1=1000000, B2=2500000, E=6
2015-10-21ramgeisNF
no factor from 2^65 to 2^66
2015-03-06VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-06VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-17JossNF-PM1
B1=148144
2014-06-24JossNF-PM1
B1=119072
2013-12-04LaurVNF
no factor from 2^62 to 2^63
2011-01-09markrNF-PM1
B1=90000, B2=1642500, E=6
2011-01-01JossNF-PM1
B1=30000
2010-11-14JossNF-PM1
B1=20000
2010-11-05JossNF-PM1
B1=15000
2009-01-08Sturle SundeNF
no factor from 2^61 to 2^62
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61