is 2 1515739 - 1
has 456283 decimal digits
takes 0.068 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.603668.6567%500000150000000.08354.9546%19.687170.2097%1.5529%
PrimeNet2570.012763.1579%65001100000.00082.4098%0.013564.0457%0.8878%
GPU722610.202765.5738%6000500000.00050.9502%0.203265.9009%0.3271%
Difference+6+19.4009+3.0829%+494000+14950000+0.0830+4.0044%+19.4839+4.3088%+4.3088%

Known prime factors (2 factors, 111.9 bits, 0.00737960% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
151573917403381735431340.663574089
3 × 31 × 6173
-3161731.219e-72.368e-54.071e-5
151573926990543155096912746072271.193890342702638677
32 × 83 × 1191891168191
2017-11-28831191891168191319.304,205.87,855.2

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1515739469726725774748816996535003512260134111.855
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:15:44alpertronManual testing5000001500000012-
skipped known factor: 1740338173543
--0.084--4.955%


Trial Factoring results:
No TF results for M1515739


ECM factoring results:

Old Calculation Method

Total ECM effort:31.170 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:31.170 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024913.89
50000500000020.112
250000400000005017.17


Lucas-Lehmer results:
No L-L results for M1515739


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T12:22:05Oliver KruseGTX-0
1740338173543
B3D5D7833BCD4B__no
2017-10-29T17:05:49kkmrkkblmbrbkc4.xlarge
1740338173543
B3D5D7833BCD4B__no
2017-11-30T02:51:18Oliver KruseGTX-3
1740338173543
2699054315509691274607
740E9677E367CE__no
2017-11-30T03:04:44ATHec2-1xf
1740338173543
2699054315509691274607
740E9677E367CE__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-26T10:13:35+00:00