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

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MnStatusDetails
2667571Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
555224914939579617432065.62016-01-25 14:29:35
ECM
DigitsB1Curves
255000064 / 280
Estimated T-Level: 21.1 ⓘ
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Matthias Menzel6538434EB497846D0
Verified (Factored)1999-04-23Dylan Jones6538434EB497846D1070513
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-30alpertronE9D74FA014A41B951013
Verified2017-11-15Oliver KruseE9D74FA014A41B951127183313
History
DateUserTypeResult
2019-07-04alpertronNF-PM1
B1=2000000, B2=60000000, E=12
2017-11-15Oliver KruseC-PRP
M2667571/55522491493957961743 : E9D74FA014A41B95
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M2667571/55522491493957961743 : E9D74FA014A41B95
PRP: Verified
PRP without proof (not generated)
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-01-25ramgeisF
Factor: 55522491493957961743 / TF: 65-66*
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2014-11-06JossNF-PM1
B1=129061
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-05-18markrNF
no factor from 2^61 to 2^62
2010-12-10markrNF-PM1
B1=105000, B2=2283750, E=6
2010-11-19JossNF-PM1
B1=20000
2009-01-31Sturle SundeNF
no factor from 2^60 to 2^61