is 2 15754807 - 1
has 4742670 decimal digits
takes 8.615 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L21BD52E4123CBAAEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.886064.1791%19500046800000.34844.7085%2.234465.8657%1.6866%
PrimeNet2650.463163.0769%7000022000000.14754.3088%0.610664.6679%1.5910%
GPU722697.577865.2174%11000028000000.20343.1181%7.781266.3019%1.0845%
Difference-2-5.6918-1.0383%+85000+1880000+0.1449+1.5904%-5.5468-0.4362%-0.4362%

Known prime factors (1 factor, 81.2 bits, 0.00051525% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1575480727321813961792813187349612581.17686709453063413640
23 × 3 × 5 × 432 × 390794362103
2016-12-31184939079436210354,90316,88131,530

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-06-02T00:00:00ANONYMOUSv4_computers1950004680000---0.348--4.709%
2002-08-10T00:00:00ANONYMOUSv4_computers1850002821250---0.261--4.205%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-02-04T00:00:00Net_Forcev4_computers21258--0.002--
2001-04-15T00:00:00ANONYMOUSv4_computers21265--0.463--
2016-03-16T02:33:03Mark RoseManual testing265266--0.474--
2014-07-10T09:44:00NesowaManual testing266267--0.949--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-11-02T00:00:00ANONYMOUSv4_computers21BD52E4123CBAAE8.615
2006-05-12T00:00:00ANONYMOUSv4_computers21BD52E4123CBAAE8.615


PRP results:
No PRP results for M15754807


P-1 factor-bounds graph:
B1 = 195000, B2 = 4680000 (P-1 stage 2)
B1 = 185000, B2 = 2821250 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
B1 = 185000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2016-12-31T18:46:56+00:00