is 2 86928217 - 1
has 26168001 decimal digits
takes 279.981 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual276176.053264.4737 %705000139237506.65603.4856 %182.709265.7120 %
Target27588.025664.0000 %5500009500000026.60103.9550 %114.626665.4238 %
Difference+1+88.0276+0.4737 %+155000-81076250-19.9451-0.4694 %+68.0826+0.2882 %

Known prime factors (1 factor, 87.9 bits, 0.00010114% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
869282172931382561861183787751890172787.9221686093804190866924
22 × 33 × 7 × 4817 × 363949 × 1272163
2018-06-243639491272163367,1171.93083.4592

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-06-24TheJudgerManual testing705000139237501222787.9227.4853.841%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-23Architects Cubedm1_362642650.043
2013-01-31LaurVManual testing2652660.086
2013-03-02SMoffatManual testing2662670.172
2013-03-10Jacques MOLNEManual testing26727443.67
2018-02-02Brian BeuningManual testing27427544.01
2018-02-08Strolling JellyfishManual testing27527688.03


ECM factoring results:
No ECM results for M86928217


Lucas-Lehmer results:
No L-L results for M86928217


PRP results:
No PRP results for M86928217


CERT results:
No CERT results for M86928217


P-1 factor-bounds graph:
B1 = 705000, B2 = 13923750 (P-1 stage 2)
B1 = 705000 (P-1 stage 1)
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104
105
106
107
108
TF factor-bounds graph:
276
275
274
267
266
265
this exponent TF target: 75
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00