is 2 66850237 - 1
has 20123927 decimal digits
takes 168.983 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
Actual2717.151563.3803 %----7.151563.3803 %
Target27457.230464.8649 %4500007500000016.53663.9273 %73.767066.2447 %
Difference-3-50.0789-1.4846 %-450000-75000000-16.5366-3.9273 %-66.6155-2.8644 %

Known prime factors (1 factor, 94.1 bits, 0.00014077% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
66850237213132204176402575407102669432994.106159410208356032137483
3 × 7 × 7219 × 19919 × 166679 × 316717
2013-08-0116667931671771,743,0520.64091.2433

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-08-01kdgehmanManual testing2994.1062.9320.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-05-031997rj7Manual testing212640.029
2010-02-03tomisa_sCOLOSSUS2642660.168
2010-04-13ANONYMOUSC8E0118AE2662670.224
2010-04-19symalladSchool_Laptop2672680.447
2010-08-23Staffan SoderhjelmSampo_IV2682690.894
2012-02-16Phil Allbis2692701.789
2012-07-07E.Lechner2702713.577


ECM factoring results:
No ECM results for M66850237


Lucas-Lehmer results:
No L-L results for M66850237


PRP results:
No PRP results for M66850237


CERT results:
No CERT results for M66850237


P-1 factor-bounds graph:
104
105
106
104
105
106
TF factor-bounds graph:
271
270
269
268
267
266
264
this exponent TF target: 74
TF double-checked to: 67
250
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Last modified: 2024-03-13T02:15:48+00:00