Marin Mersenne 2^P-1
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MnStatusDetails
338237Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
288321870118614435812169592684.62019-03-26 07:06:38
ECM
DigitsB1Curves
2550000280 / 280
30250000434 / 640
Estimated T-Level: 28.4 ⓘ
TF below 2^89 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski369D0
Verified (Factored)Unknown769D0
Verified (Factored)Guillermo Ballester Valor11CB29908A94F69D0
Verified (Factored)Eivind Triel11CB29908A94F69D196149
Verified (Factored)2002-01-15Dennis Pope11CB29908A94F69D216769
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-03-26ANONYMOUSA6205829B8A07FC3113411953
Verified2019-03-27artorolloA6205829B8A07FC3124847053
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-06-27George WoltmanNF-PP1
Start=2/7, B1=30000000, B2=3060000000
2019-03-27artorolloC-PRP
M338237/28832187011861443581216959 : A6205829B8A07FC3
PRP: Verified
PRP without proof (small exponent)
2019-03-26ANONYMOUSC-PRP
M338237/28832187011861443581216959 : A6205829B8A07FC3
PRP: Verified
PRP without proof (small exponent)
2019-03-26alexF-ECM
Factor: 28832187011861443581216959 / (ECM curve 134, B1=250000, B2=25000000, Sigma=8424290339125183)
2018-01-27Gordon SpenceNF
no factor from 2^64 to 2^65
2016-08-31mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2015-12-15Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-15Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-25NRNF
no factor from 2^61 to 2^62
2013-05-13Sid & AndyNF
no factor from 2^60 to 2^61
2012-02-01alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-08-09JossNF-PM1
B1=1354696
2009-01-25Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-30Sturle SundeNF
no factor from 2^58 to 2^59