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

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MnStatusDetails
4991983Factored
FactorDigitsBitsDate
5277098841318130884423132478.82020-08-19 05:04:15
ECM
DigitsB1Curves
255000040 / 280
Estimated T-Level: 20.7 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-06-20IES R.Dieste-I.LarrosaC43822D4936F90B40
Bad2000-04-12MechEngrGATech6E9B920AD8AC6313310699
Verified (Factored)2001-04-08Lars DauschC43822D4936F90B41009539
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-08-19M MillerB4B6E7390B2C57611426059453
History
DateUserTypeResult
2020-08-21TomCERT
PRP Certification
Proof certified good
2020-08-19M MillerC-PRP
M4991983/527709884131813088442313 : B4B6E7390B2C5761
PRP proof power = 7
PRP: Verified
Proof certified good
2020-08-19Smok_bmv F-ECM
Factor: 527709884131813088442313 / (ECM curve 18, B1=50000, B2=50000000)
2018-06-05ramgeisNF
no factor from 2^67 to 2^68
2017-05-21YxinityNF
no factor from 2^66 to 2^67
2017-02-05Squeeky_SquirrelNF-PM1
B1=300000, B2=9375000, E=12
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-07-31snme2pm1NF
no factor from 2^65 to 2^66
2014-11-07lycornNF
no factor from 2^64 to 2^65
2014-11-07lycornNF
no factor from 2^63 to 2^64
2011-12-13Squeeky_SquirrelNF-PM1
B1=120000, B2=2430000, E=6
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-07-06Squeeky_SquirrelNF-PM1
B1=60000, B2=990000, E=6
2008-09-05Sturle SundeNF
no factor from 2^61 to 2^62