is 2 15007591 - 1
has 4517736 decimal digits
takes 7.187 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1687B8D0BA6CB679double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2683.971664.7059%17000024225000.20333.5865%4.174965.9717%1.2658%
PrimeNet2650.486163.0769%6500020000000.11834.1432%0.604564.6067%1.5298%
GPU722697.955165.2174%10000026000000.16402.9935%8.119166.2586%1.0412%
Difference-1-3.9834-0.5115%+70000-177500+0.0392+0.5930%-3.9442-0.2869%-0.2869%

Known prime factors (1 factor, 72.5 bits, 0.00048279% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1500759164760916214688632778472272.456215760531502653
3 × 4297 × 16737299783
2016-11-2142971673729978374.111633.211,182.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-03T00:00:00ANONYMOUSv4_computers1700002422500---0.203--3.587%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-08T00:00:00ANONYMOUSv4_computers21265--0.486--
2014-06-11T15:16:00NesowaManual testing265266--0.498--
2014-06-11T15:16:00NesowaManual testing266267--0.996--
2015-10-19T17:00:16mikrManual testing267268--1.992--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-04-14T00:00:00ANONYMOUSv4_computers1687B8D0BA6CB6797.187
2006-01-15T00:00:00georgepv4_computers1687B8D0BA6CB6797.187


PRP results:
No PRP results for M15007591


P-1 factor-bounds graph:
B1 = 170000, B2 = 2422500 (P-1 stage 2)
B1 = 170000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2016-11-21T05:37:04+00:00