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

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MnStatusDetails
2277857Factored
FactorDigitsBitsDate
51980686761480357623032272.12020-07-20 13:39:18
ECM
DigitsB1Curves
255000083 / 280
Estimated T-Level: 21.5
TF below 2^66 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)John Durbetaki773EAFAB5BC553F60
Verified (Factored)Michael Lynd773EAFAB5BC553F60
Verified (Factored)1999-03-15Kent Lee773EAFAB5BC553F62160863
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-07-20ATH4A1AB16EB74C710C150728453
Verified2020-07-21marssystems4A1AB16EB74C710C193294253
History
DateUserTypeResult
2020-07-21marssystemsC-PRP
M2277857/5198068676148035762303 : 4A1AB16EB74C710C
PRP: Verified
PRP without proof (not generated)
2020-07-20ATHC-PRP
M2277857/5198068676148035762303 : 4A1AB16EB74C710C
PRP: Verified
PRP without proof (not generated)
2020-07-20GANF-ECM
Factor: 5198068676148035762303 / (ECM curve 2, B1=50000, B2=5000000, Sigma=4261944215765176)
2019-04-22TJAOINF
no factor from 2^67 to 2^68
2019-03-05KingNF-PM1
B1=2800000, B2=82000000, E=6
2018-09-12JossNF-PM1
B1=653184, B2=3265920
2018-09-05JossNF-PM1
B1=653184, B2=1959552
2018-09-03JossNF-PM1
B1=653184, B2=1306368
2018-08-30JossNF-PM1
B1=653184
2017-02-13Smok_bmv NF
no factor from 2^66 to 2^67
2016-04-15JossNF-PM1
B1=326592, B2=11831037, E=6
2016-04-07JossNF-PM1
B1=326592, B2=5878656, E=12
2016-03-20JossNF-PM1
B1=272160
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-11-01ramgeisNF
no factor from 2^65 to 2^66
2015-03-10VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-10VictordeHollanderNF
no factor from 2^63 to 2^64
2014-09-15-Anonymous-NF-PM1
B1=133177
2013-12-06Jerry HallettNF
no factor from 2^62 to 2^63
2012-05-06Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-01markrNF-PM1
B1=105000, B2=2152500, E=6
2010-11-14JossNF-PM1
B1=30000
2010-11-06JossNF-PM1
B1=15000
2009-01-10Sturle SundeNF
no factor from 2^60 to 2^61