is 2 72865847 - 1
has 21934806 decimal digits
takes 194.815 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
Actual27452.505663.5135 %6700006700002.59741.7373 %55.103064.1474 %
Target27452.505663.5135 %5000008500000019.78614.1236 %72.291765.0181 %
Difference---+170000-84330000-17.1886-2.3863 %-17.1886-0.8707 %

Known prime factors (1 factor, 74.7 bits, 0.00010252% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
72865847307085128442234535783372374.701210719521617744
24 × 3 × 19 × 67 × 6143 × 561377
2014-11-07614356137775.9640.14110.2215

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-11-07Fabrice Bellet574ae247.0167000067000012374.7012.5971.737%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-09-19Wojciech FlorekManual testing212640.026
2010-05-23ANONYMOUS2642650.051
2010-05-24S00030vd012652660.103
2010-05-26E.Lechnercore2duo2662670.205
2010-05-29Net_ForceKathy_PC2672680.410
2010-06-10ganghojdg12682690.820
2012-12-19kdgehmanManual testing2692714.923
2014-11-02kdgehmanManual testing27127445.94


ECM factoring results:
No ECM results for M72865847


Lucas-Lehmer results:
No L-L results for M72865847


PRP results:
No PRP results for M72865847


CERT results:
No CERT results for M72865847


P-1 factor-bounds graph:
B1 = 670000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
TF factor-bounds graph:
274
271
269
268
267
266
265
264
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00