Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
11966777Factored
FactorDigitsBitsDate
166195640256989672873649112683.82021-08-07 22:11:43
ECM
DigitsB1Curves
255000087 / 280
Estimated T-Level: 21.6 ⓘ
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-02-25Craig EtterAA8B55A6A166FC196251285
Verified (Factored)2004-05-25Ars Technica Team Prime RibAA8B55A6A166FC191179866
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-12-15Alex Bozich16138EA142784A4D1491094453
History
DateUserTypeResult
2021-12-15Simon JosefssonCERT
PRP Certification
Proof certified good
2021-12-15Alex BozichC-PRP
M11966777/16619564025698967287364911 : 16138EA142784A4D
PRP proof power = 8
PRP: Verified
Proof certified good
2021-08-15SRBaseNF
no factor from 2^70 to 2^71
2021-08-07LaurVF-PP1
Start=2/7, B1=5000000, B2=300000000, Factor: 16619564025698967287364911
2021-07-30LaurVNF-PM1
B1=6189107, B2=185673210
2021-07-12LaurVNF-PM1
B1=3161897, B2=107127521
2021-06-05Dylan DelgadoNF-PM1
B1=900000, B2=27000000, e=12
2021-05-21lycornNF
no factor from 2^69 to 2^70
2018-01-14ramgeisNF
no factor from 2^68 to 2^69
2018-01-14ramgeisNF
no factor from 2^67 to 2^68
2016-03-08YxinityNF
no factor from 2^66 to 2^67
2015-10-20Sid & AndyNF-PM1
B1=130000, B2=2275000, E=6
2013-10-20NesowaNF
no factor from 2^65 to 2^66
2013-10-06lycornNF
no factor from 2^64 to 2^65