is 2 66248431 - 1
has 19942765 decimal digits
takes 167.461 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
Actual27457.750364.8649 %----57.750364.8649 %
Target27457.750364.8649 %4500007500000016.53663.9229 %74.286966.2432 %
Difference----450000-75000000-16.5366-3.9229 %-16.5366-1.3783 %

Known prime factors (1 factor, 76.7 bits, 0.00011583% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
662484311257648137781650243657532476.735949190885578596
22 × 3 × 31 × 1163 × 28979 × 75709
2014-03-282897975709244.810.11550.2162

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-03-28Earle Lowework-imac2476.7352.5470.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-05-031997rj7Manual testing212640.030
2009-12-02amanattoneko2642650.056
2009-12-04Team_Elteor_Borislavj~ElteorHW42652660.113
2009-12-14Michael Hanschoimbm-heimo2662670.226
2010-02-21]mh[ Virtekwork32672680.451
2010-02-24]mh[ Virtekwork32682690.902
2012-02-10LautturiUuttera_Lautturi2692701.805
2012-06-27xiaowuc1eight2702713.610
2014-03-22Bill StaffenManual testing27127450.53


ECM factoring results:
No ECM results for M66248431


Lucas-Lehmer results:
No L-L results for M66248431


PRP results:
No PRP results for M66248431


CERT results:
No CERT results for M66248431


P-1 factor-bounds graph:
103
104
105
103
104
105
TF factor-bounds graph:
274
271
270
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