is 2 15490991 - 1
has 4663253 decimal digits
takes 7.769 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
Actual2671.918164.1791 %49600054892656022.089910.7427 %24.008068.0272 %
Target2697.706965.2174 %110000140000000.63033.1104 %8.337266.2993 %
Difference-2-5.7887-1.0383 %+386000+534926560+21.4596+7.6323%+15.6709+1.7280 %

Known prime factors (2 factors, 118.3 bits, 0.00076396% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15490991457431900903413511755.3441476444925
52 × 1087 × 54331
-1087543310.00060.00290.0040
1549099192225110686742950011963.000297673372500
22 × 3 × 54 × 7 × 5669969
2016-11-2362556699690.09730.22510.4196

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2023-07-05JacobZPM1Server496000548926560
skipped known factor: 45743190090341351
skipped known factor: 9222511068674295001
--26.799.113%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-11-23TJAOIManual testing262263*
63.000
19
0.063


ECM factoring results:
No ECM results for M15490991


Lucas-Lehmer results:
No L-L results for M15490991


PRP results:
dateuseridcompidcofactorsres64
2023-08-09Perigbrollach
45743190090341351
9222511068674295001
F1FC9A5A150A6245


CERT results:
dateuseridcompid
2023-08-09LOBESE570


P-1 factor-bounds graph:
B1 = 496000, B2 = 548926560 (P-1 stage 2)
B1 = 496000 (P-1 stage 1)
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109
TF factor-bounds graph:
this exponent TF target: 69
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00