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

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MnStatusDetails
2559631Factored
FactorDigitsBitsDate
671635542651714498135083292685.82020-09-18 19:14:01
ECM
DigitsB1Curves
255000068 / 280
Estimated T-Level: 21.2
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Sean C. McGintyAF2850477C0EC69B0
Verified (Factored)1999-05-16Roney BelhassofAF2850477C0EC69B1931193
Verified (Factored)2018-06-13kkmrkkblmbrbkAF2850477C0EC69B174078
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-09-19Team_InspectorB237BF0FAE3888231146108753
History
DateUserTypeResult
2020-09-19Stef42CERT
PRP Certification
Proof certified good
2020-09-19Team_InspectorC-PRP
M2559631/67163554265171449813508329 : B237BF0FAE388823
PRP proof power = 7
PRP: Verified
Proof certified good
2020-09-18Chang Chia-TcheF-ECM
Factor: 67163554265171449813508329 / (ECM curve 4, B1=50000, B2=5000000, Sigma=5123150747741536)
2019-03-25TJAOINF
no factor from 2^67 to 2^68
2018-06-13kkmrkkblmbrbkC-LL
AF2850477C0EC69B
2017-08-11Gordon SpenceNF
no factor from 2^66 to 2^67
2016-04-20mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-08omylistNF
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
2011-12-27c10ck3rNF
no factor from 2^61 to 2^62
2011-04-11James HeinrichNF-PM1
B1=175000, B2=4068750, E=6
2011-01-09JossNF-PM1
B1=50000
2011-01-03JossNF-PM1
B1=30000
2010-12-21JossNF-PM1
B1=20000
2009-02-01Sturle SundeNF
no factor from 2^60 to 2^61