is 2 12720847 - 1
has 3829357 decimal digits
takes 5.196 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
Actual2672.335864.1791 %40000042845985014.05019.9894 %16.386067.7574 %
Target2684.685664.7059 %90000110000000.40543.0983 %5.091065.7994 %
Difference-1-2.3498-0.5268 %+310000+417459850+13.6447+6.8911%+11.2950+1.9580 %

Known prime factors (2 factors, 101.2 bits, 0.00079537% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12720847610600657929.18624
23 × 3
-885.652e-124.738e-69.643e-6
1272084746983283657942264351692271.993184670421937872
24 × 3 × 13 × 379 × 1583 × 493279
2022-05-04158349327952.8160.01680.0297

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-05-03nordisweet16_30.8b14400000400000
skipped known factor: 610600657
--0.2372.159%
2022-05-04nordisweet16_30.8b1440000042845985022271.99316.479.182%


Trial Factoring results:
575859606162636465666768
No TF results for M12720847


ECM factoring results:
No ECM results for M12720847


Lucas-Lehmer results:
No L-L results for M12720847


PRP results:
dateuseridcompidcofactorsres64
2022-05-04XZT800G5Mini1
610600657
7A5AC381A6D2A9B0
2023-03-05Naegi Makoto5950X
610600657
4698328365794226435169
7A5AC381A6D2A9B0


CERT results:
dateuseridcompid
2022-05-04Dark_Mx_87AMDS001
2023-03-06MARK_DANA_ROCKMAN


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