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

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MnStatusDetails
1977721Factored
FactorDigitsBitsDate
47156714134300748652099132582.02020-04-02 08:01:53
ECM
DigitsB1Curves
2550000269 / 280
Estimated T-Level: 24.8
TF below 2^77 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Walt Armour8BD5C0A72A24D0850
Verified (Factored)1999-02-21David M. Anderson8BD5C0A72A24D0851472523
Verified (Factored)2015-07-12MadPoo8BD5C0A72A24D0851856359
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-04-02M Miller4A2DF5A42D67536B18912253
Verified2020-04-03marssystems4A2DF5A42D67536B1178023153
History
DateUserTypeResult
2020-04-03marssystemsC-PRP
M1977721/4715671413430074865209913 : 4A2DF5A42D67536B
PRP: Verified
PRP without proof (not generated)
2020-04-02M MillerC-PRP
M1977721/4715671413430074865209913 : 4A2DF5A42D67536B
PRP: Verified
PRP without proof (not generated)
2020-04-02MarkSF-ECM
Factor: 4715671413430074865209913 / (ECM curve 2, B1=50000, B2=5000000, Sigma=1454142880495500)
2018-11-26JossNF-PM1
B1=1977721, B2=247215125, E=12
2018-06-11ramgeisNF
no factor from 2^70 to 2^71
2018-05-28JossNF-PM1
B1=1977721, B2=197772100, E=12
2018-03-08YxinityNF
no factor from 2^69 to 2^70
2018-03-08YxinityNF
no factor from 2^68 to 2^69
2018-03-08YxinityNF
no factor from 2^67 to 2^68
2018-03-08YxinityNF
no factor from 2^66 to 2^67
2018-03-06JossNF-PM1
B1=1977721, B2=120000000, E=12
2018-02-14JossNF-PM1
B1=1977721, B2=60000000, E=12
2018-01-23JossNF-PM1
B1=1977721, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-09-10ramgeisNF
no factor from 2^65 to 2^66
2015-07-12MadPooC-LL
8BD5C0A72A24D085
2015-03-17lycornNF
no factor from 2^64 to 2^65
2015-03-17lycornNF
no factor from 2^63 to 2^64
2011-09-03GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-02-25kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2009-12-23S485122NF
no factor from 2^60 to 2^61