is 2 66465281 - 1
has 20008044 decimal digits
takes 168.009 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
Actual27328.779664.3836 %640000136000004.93384.4338 %33.713465.9627 %
Target27457.561964.8649 %4500007500000016.53663.9245 %74.098566.2437 %
Difference-1-28.7823-0.4813 %+190000-61400000-11.6028+0.5094%-40.3850-0.2810 %

Known prime factors (1 factor, 85.7 bits, 0.00012894% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
66465281629254283613686469725262492685.702473370663710642004
22 × 33 × 2141 × 175949 × 11635207
2014-04-2717594911635207127,6912.93334.3396

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-04-27TheJudgerManual testing640000136000001222685.7022.9324.028%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-04-131997rj7Manual testing212640.030
2009-12-01XenonD-net2642650.056
2009-12-04XenonD-net2652660.112
2009-12-09PrimeCruncherApollo72662670.225
2010-02-14magicxhTHAPE2672680.450
2010-05-12Stephen Woodcdl22682690.899
2012-02-16ANONYMOUS2692701.799
2012-09-10trifbrownie2702713.598
2014-04-20TheJudgerManual testing27127321.59


ECM factoring results:
No ECM results for M66465281


Lucas-Lehmer results:
No L-L results for M66465281


PRP results:
No PRP results for M66465281


CERT results:
No CERT results for M66465281


P-1 factor-bounds graph:
B1 = 640000, B2 = 13600000 (P-1 stage 2)
B1 = 640000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 74
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00