is 2 12815813 - 1
has 3857945 decimal digits
takes 5.235 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
Actual2672.318564.1791 %40000042845985014.05019.9970 %16.368667.7601 %
Target2684.650964.7059 %90000120000000.43763.1622 %5.088565.8219 %
Difference-1-2.3323-0.5268 %+310000+416459850+13.6125+6.8348%+11.2801+1.9382 %

Known prime factors (1 factor, 58.1 bits, 0.00045296% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
128158132984980021701032331858.05011645691232
25 × 72 × 7427099
2000-04-124974270990.00420.23970.4476

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-04-21nordisweet16_30.8b14400000400000--0.2372.162%
2022-05-11nordisweet16_30.8b14400000428459850
skipped known factor: 298498002170103233
--16.479.189%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-04-12Ken Warnerv4_computers??
58.050
18


ECM factoring results:
No ECM results for M12815813


Lucas-Lehmer results:
No L-L results for M12815813


PRP results:
dateuseridcompidcofactorsres64
2022-06-04MichaelEZwoelfer
298498002170103233
932B8C06D5DEB875


CERT results:
dateuseridcompid
2022-06-04Simon Josefssoncto9


P-1 factor-bounds graph:
B1 = 400000, B2 = 428459850 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 68
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00