is 2 15711923 - 1
has 4729761 decimal digits
takes 8.591 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2908192F2B094A4Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.891264.1791%30000060000000.48415.2111%2.375366.0458%1.8667%
PrimeNet2650.464363.0769%7000022000000.14754.3072%0.611964.6673%1.5903%
GPU722697.598565.2174%11000028000000.20343.1168%7.801966.3015%1.0841%
Difference-2-5.7073-1.0383%+190000+3200000+0.2807+2.0943%-5.4266-0.2557%-0.2557%

Known prime factors (1 factor, 84.2 bits, 0.00053617% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15711923228730671758690254178574312684.242727888851538701705
32 × 5 × 34620871 × 467212619
2016-12-2734620871467212619361,89146.13755.865

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-05-25T00:00:00curtiscv4_computers235000235000---0.186--1.999%
2015-11-28T21:23:28ThaManual testing300000600000012---0.484--5.211%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-28T00:00:00Net_Forcev4_computers21258--0.002--
2001-05-06T00:00:00ANONYMOUSv4_computers21265--0.464--
2016-03-16T02:21:44Mark RoseManual testing265266--0.476--
2014-07-10T09:15:00NesowaManual testing266267--0.951--


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)
2002-08-03T00:00:00curtiscv4_computers2908192F2B094A4E8.591
2006-02-15T00:00:00ANONYMOUSv4_computers2908192F2B094A4E8.591


PRP results:
No PRP results for M15711923


P-1 factor-bounds graph:
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 235000 (P-1 stage 1)
104
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107
108
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
258
250
260
270
280
290
2100
Last modified: 2016-12-27T13:03:52+00:00