is 2 12896447 - 1
has 3882218 decimal digits
takes 5.268 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
Actual2672.304064.1791 %40000042845985014.050110.0034 %16.354167.7624 %
Target2684.621864.7059 %90000120000000.43763.1651 %5.059465.8230 %
Difference-1-2.3178-0.5268 %+310000+416459850+13.6125+6.8383%+11.2947+1.9394 %

Known prime factors (1 factor, 57.0 bits, 0.00044208% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
128964471453883917954023191857.0135636761497
32 × 71 × 8821223
2000-04-197188212230.00190.28470.5317

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-05-15nordisweet16_30.8b14400000400000--0.2372.164%
2022-05-19nordisweet16_30.8b14400000428459850
skipped known factor: 145388391795402319
--16.479.195%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-04-19ANONYMOUSv4_computers??
57.013
18


ECM factoring results:
No ECM results for M12896447


Lucas-Lehmer results:
No L-L results for M12896447


PRP results:
dateuseridcompidcofactorsres64
2022-07-21Oliver KruseServer-Phi
145388391795402319
61639BE8F362B7A8


CERT results:
dateuseridcompid
2022-07-21PCanalytics.compraxis-wb1


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