is 2 66727501 - 1
has 20086980 decimal digits
takes 168.672 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
Actual27457.335764.8649 %----57.335764.8649 %
Target27457.335764.8649 %4500007500000016.53663.9264 %73.872366.2444 %
Difference----450000-75000000-16.5366-3.9264 %-16.5366-1.3795 %

Known prime factors (1 factor, 76.6 bits, 0.00011484% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
667275011171851171593554852700812476.633878087111035040
25 × 5 × 29 × 307 × 401 × 1537223
2014-06-034011537223385.230.30840.5733

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-06-03kharlanMBP15Ret2476.6334.4090.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-03-161997rj7Manual testing212640.029
2010-04-19The Magic ForestGuest2642650.056
2010-04-20TeraTismS2652660.112
2010-04-25MRodezno2662670.224
2010-07-04trifdrake2672680.448
2010-09-28trifdrake2682690.896
2012-02-16ANONYMOUS2692701.792
2012-07-06Jason Kruppaz4002702713.584
2014-03-25kdgehmanManual testing27127321.50
2014-06-01RichD0Manual testing27327428.67


ECM factoring results:
No ECM results for M66727501


Lucas-Lehmer results:
No L-L results for M66727501


PRP results:
No PRP results for M66727501


CERT results:
No CERT results for M66727501


P-1 factor-bounds graph:
101
102
103
101
102
103
104
105
106
107
TF factor-bounds graph:
274
273
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