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

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MnStatusDetails
2101873Factored
FactorDigitsBitsDate
794681777286516113563612376.12017-11-07 08:06:29
ECM
DigitsB1Curves
2550000140 / 280
Estimated T-Level: 22.5 ⓘ
TF below 2^70 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Bernhard BrandmairE42C81F20BEA5E730
Verified (Factored)1999-04-23Stephen WoodE42C81F20BEA5E73227286
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-11-08Oliver Kruse4731E805DA8063931101418453
Verified2017-11-08Yaroslav Berezhko4731E805DA806393194537853
History
DateUserTypeResult
2017-11-08Yaroslav BerezhkoC-PRP
M2101873/79468177728651611356361 : 4731E805DA806393
PRP: Verified
PRP without proof (not generated)
2017-11-08Oliver KruseC-PRP
M2101873/79468177728651611356361 : 4731E805DA806393
PRP: Verified
PRP without proof (not generated)
2017-11-07Sid & AndyF-ECM
Factor: 79468177728651611356361 / (ECM curve 10, B1=50000, B2=5000000)
2017-08-19JossNF-PM1
B1=400000, B2=4000000, E=6
2017-06-25mikrNF-PM1
B1=2500000, B2=125000000, E=12
2016-11-08JossNF-PM1
B1=240000
2016-10-01Gordon SpenceNF
no factor from 2^66 to 2^67
2016-04-26JossNF-PM1
B1=200000, B2=7423544, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-12-23ramgeisNF
no factor from 2^65 to 2^66
2015-03-15VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-15VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-18JossNF-PM1
B1=161074
2014-08-21JossNF-PM1
B1=130537
2013-09-04ramgeisNF
no factor from 2^62 to 2^63
2012-03-26Sebastian HornbostelNF
no factor from 2^61 to 2^62
2009-01-03Sturle SundeNF
no factor from 2^60 to 2^61