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

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MnStatusDetails
1918181Factored
FactorDigitsBitsDate
719687082660721192417432375.92020-08-02 07:03:41
ECM
DigitsB1Curves
2550000280 / 280
30250000108 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Robert Friberg17C479F7013961BF0
Verified (Factored)1998-12-21Bruce Mitchell17C479F7013961BF907047
Verified (Factored)2015-06-27MadPoo17C479F7013961BF1509847
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-08-02ANONYMOUS972637BD449066E31123022653
Verified2020-08-02M Miller972637BD449066E3129572453
History
DateUserTypeResult
2020-08-02M MillerC-PRP
M1918181/71968708266072119241743 : 972637BD449066E3
PRP: Verified
PRP without proof (not generated)
2020-08-02ANONYMOUSC-PRP
M1918181/71968708266072119241743 : 972637BD449066E3
PRP: Verified
PRP without proof (not generated)
2020-08-02GANF-ECM
Factor: 71968708266072119241743 / (ECM curve 3, B1=50000, B2=5000000, Sigma=7699921537043090)
2019-04-28chuenkitNF
no factor from 2^67 to 2^68
2018-01-03mikrNF-PM1
B1=8000000, B2=320000000, E=12
2017-03-15Smok_bmv NF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-09-02ramgeisNF
no factor from 2^65 to 2^66
2015-06-27MadPooC-LL
17C479F7013961BF
2014-12-17lycornNF
no factor from 2^64 to 2^65
2014-12-17Chris SmithNF
no factor from 2^63 to 2^64
2011-10-04kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2009-06-01Architects CubedNF
no factor from 2^60 to 2^61