Marin Mersenne 2^P-1
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MnStatusDetails
2721913Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
3457990022255016597612168.22020-08-20 11:14:34
ECM
DigitsB1Curves
2550000127 / 280
Estimated T-Level: 22.3 ⓘ
TF below 2^69 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Christian SchweingruberEA01A326D0B64BFF0
Verified (Factored)1999-05-16John T MarshallEA01A326D0B64BFF967317
Verified (Factored)2018-08-06kkmrkkblmbrbkEA01A326D0B64BFF1270925
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-08-20M MillerF75F41B8242C2D6D1221024253
History
DateUserTypeResult
2023-04-18Kevin_9611NF-PM1
B1=720000, B2=868549500
2020-08-20Ben DeloCERT
PRP Certification
Proof certified good
2020-08-20M MillerC-PRP
M2721913/345799002225501659761 : F75F41B8242C2D6D
PRP proof power = 7
PRP: Verified
Proof certified good
2020-08-20M. R. MayerF-ECM
Factor: 345799002225501659761 / (ECM curve 3, B1=50000, B2=5000000, Sigma=5341657708434852)
2019-02-12chuenkitNF
no factor from 2^67 to 2^68
2018-08-20JossNF-PM1
B1=600000, B2=6000000, E=6
2018-08-06kkmrkkblmbrbkC-LL
EA01A326D0B64BFF
2017-10-05Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2016-01-31ramgeisNF
no factor from 2^65 to 2^66
2015-04-13VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-13VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-04-17markrNF
no factor from 2^61 to 2^62
2011-02-23James HeinrichNF-PM1
B1=300000, B2=8000000, E=12
2011-01-18JossNF-PM1
B1=50000
2010-12-28JossNF-PM1
B1=30000
2010-12-19JossNF-PM1
B1=20000
2009-01-28Sturle SundeNF
no factor from 2^60 to 2^61