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

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MnStatusDetails
9878747Factored
FactorDigitsBitsDate
85979636167871407690012272.92015-02-13 00:03:12
ECM
DigitsB1Curves
25500001 / 280
Estimated T-Level: 20.0
TF below 2^61 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2000-08-31Matt Fischer3BC49364ABB1C30E7020415
Verified (Factored)2003-09-21Craig Etter3BC49364ABB1C30E2459129
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2019-11-10mnd9B42BC6FBE991E31C1548577153
Verified2021-01-07kutensB42BC6FBE991E31C1516647953
History
DateUserTypeResult
2021-01-07Ben DeloCERT
PRP Certification
Proof certified good
2021-01-07kutensC-PRP
M9878747/8597963616787140769001 : B42BC6FBE991E31C
PRP proof power = 8
PRP: Verified
Proof certified good
2019-11-10mnd9C-PRP
M9878747/8597963616787140769001 : B42BC6FBE991E31C
PRP: Verified
PRP without proof (not generated)
2015-02-13JimBaF-ECM
Factor: 8597963616787140769001 / (ECM curve 1, B1=50000, B2=5000000)
2013-08-24NesowaNF
no factor from 2^64 to 2^65
2013-04-08NesowaNF-PM1
B1=120000, B2=2370000, E=6