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

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MnStatusDetails
2571181Factored
FactorDigitsBitsDate
7209665190492488421538072479.32020-07-02 10:26:07
ECM
DigitsB1Curves
255000038 / 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)William H. GeigerAD9B8617FF064BB50
Verified (Factored)1999-05-02Louis TowlesAD9B8617FF064BB51744144
Verified (Factored)2018-06-16kkmrkkblmbrbkAD9B8617FF064BB51594600
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-07-02mrh68AFF281FF3BAC03182476253
Verified2020-07-03nordi68AFF281FF3BAC03126073153
History
DateUserTypeResult
2020-07-03nordiC-PRP
M2571181/720966519049248842153807 : 68AFF281FF3BAC03
PRP: Verified
PRP without proof (not generated)
2020-07-02mrhC-PRP
M2571181/720966519049248842153807 : 68AFF281FF3BAC03
PRP: Verified
PRP without proof (not generated)
2020-07-02GANF-ECM
Factor: 720966519049248842153807 / (ECM curve 2, B1=50000, B2=5000000, Sigma=8175347462544809)
2019-09-06YxinityNF
no factor from 2^67 to 2^68
2018-06-16kkmrkkblmbrbkC-LL
AD9B8617FF064BB5
2017-08-13Gordon SpenceNF
no factor from 2^66 to 2^67
2016-06-12mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-08ramgeisNF
no factor from 2^65 to 2^66
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-18Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-04-16James HeinrichNF-PM1
B1=175000, B2=4112500, E=6
2011-01-10JossNF-PM1
B1=50000
2010-12-21JossNF-PM1
B1=20000
2009-01-30Sturle SundeNF
no factor from 2^60 to 2^61