is 2 666666829 - 1
has 200686713 decimal digits
takes 21,612.660 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
Actual2745.738859.4595 %33600003360000157.94534.1302 %163.684161.1339 %
Target2845,876.800064.2857 %36000009000000002,464.99674.1495 %8,341.796765.7677 %
Difference-10-5,871.0612-4.8263 %-240000-896640000-2,307.0514-0.0193 %-8,178.1126-4.6338 %

Known prime factors (1 factor, 86.2 bits, 0.00001292% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
666666829865343837391309363279847612686.16164900772001010220
22 × 5 × 11 × 17 × 13913 × 20231 × 61651
2015-12-01202316165123,5071.05711.9355

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-12-01LaurVManual testing3360000336000012686.161157.51.541%


Trial Factoring results:
57585960616263646566676869707172737475767778798081828384
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2023-10-18James HeinrichManual testing267268
2023-10-18James HeinrichManual testing268269
2008-09-22monstabbe2692700.179
2009-05-06unconnectedwinxp-E73002702710.359
2009-05-19unconnectedgreece-E67502712720.717
2009-07-07unconnectedwinxp-E46002722731.435
2013-04-08ramgeisManual testing2732742.870


ECM factoring results:
No ECM results for M666666829


Lucas-Lehmer results:
No L-L results for M666666829


PRP results:
No PRP results for M666666829


CERT results:
No CERT results for M666666829


P-1 factor-bounds graph:
B1 = 3360000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
this exponent TF target: 84
TF double-checked to: 67
250
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Last modified: 2024-03-13T02:15:48+00:00