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

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MnStatusDetails
2207237Factored
FactorDigitsBitsDate
7349085057035327873085532479.32015-11-09 20:15:19
ECM
DigitsB1Curves
255000094 / 280
Estimated T-Level: 21.7
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-02-08Scott GaliardoD5A612B2094137060
Verified (Factored)1999-02-21Per Magne KnutsenD5A612B2094137061864514
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron8826A57CBA0B20EF1013
Verified2017-10-25Oliver Kruse8826A57CBA0B20EF1102714613
P-1 factors
DateFactorB1B2
2015-11-0973490850570353278730855310000002500000
History
DateUserTypeResult
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-10-25Oliver KruseC-PRP
M2207237/734908505703532787308553 : 8826A57CBA0B20EF
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M2207237/734908505703532787308553 : 8826A57CBA0B20EF
PRP: Verified
PRP without proof (not generated)
2016-04-13alpertronNF-PM1
B1=500000, B2=15000000, E=12
2015-11-09Alexander DubrovinF-PM1
Factor: 734908505703532787308553 / (P-1, 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=148158
2014-06-24JossNF-PM1
B1=119079
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
2009-01-03Sturle SundeNF
no factor from 2^60 to 2^61