is 2 89281183 - 1
has 26876315 decimal digits
takes 300.993 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
Actual276171.413464.4737 %770000180950008.37833.7277 %179.791765.7980 %
Target27585.705764.0000 %60000010000000029.40654.0531 %115.112265.4591 %
Difference+1+85.7077+0.4737 %+170000-81905000-21.0282-0.3255 %+64.6795+0.3389 %

Known prime factors (1 factor, 80.2 bits, 0.00008980% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8928118313651811329976218460961292580.1757645402352014208
27 × 19 × 37 × 65173 × 1303669
2019-02-046517313036694,029.70.64840.6485

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-01-23penluManual testing770000180950002--9.0024.101%
2019-02-04treborManual testing72500014318750622580.1757.6983.888%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-08Architects Cubedm1_412642650.042
2013-03-19Ilhomzoom-zoom2652660.084
2013-03-19timc995dl580_g5b2662670.167
2013-03-26Sergey NosovManual testing26727321.09
2017-09-05Brian BeuningManual testing27327421.43
2018-09-20Strolling JellyfishManual testing274276128.6


ECM factoring results:
No ECM results for M89281183


Lucas-Lehmer results:
No L-L results for M89281183


PRP results:
No PRP results for M89281183


CERT results:
No CERT results for M89281183


P-1 factor-bounds graph:
B1 = 770000, B2 = 18095000 (P-1 stage 2)
B1 = 725000, B2 = 14318750 (P-1 stage 2)
B1 = 770000 (P-1 stage 1)
B1 = 725000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
276
274
273
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
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Last modified: 2024-03-13T02:15:48+00:00