is 2 13948411 - 1
has 4198891 decimal digits
takes 6.189 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA13889450FF807CFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2672.130364.1791%15000018375000.15563.6519%2.285965.4873%1.3082%
PrimeNet2650.523063.0769%6000019000000.10313.9998%0.626164.5538%1.4768%
GPU722698.559265.2174%9000024000000.13892.8515%8.698066.2092%0.9918%
Difference-2-6.4289-1.0383%+60000-562500+0.0168+0.8004%-6.4121-0.7220%-0.7220%

Known prime factors (1 factor, 73.8 bits, 0.00052924% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13948411166827911183293760964892373.821598017620728604
22 × 59 × 15889 × 159479701
2016-08-3115889159479701239.975.599610.440

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-24T00:00:00Todd A. Hayesv4_computers1500001837500---0.156--3.652%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-08-01T00:00:00lalerav4_computers21254--0.000--
2000-08-17T00:00:00Ed Strakerv4_computers21265--0.523--
2014-07-15T13:19:00NesowaManual testing265266--0.536--
2015-09-13T10:58:00NesowaManual testing266267--1.071--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.675 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.675 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.675


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-04-28T00:00:00Todd A. Hayesv4_computersA13889450FF807CF6.189
2005-03-20T00:00:00ANONYMOUSv4_computersA13889450FF807CF6.189


PRP results:
No PRP results for M13948411


P-1 factor-bounds graph:
B1 = 150000, B2 = 1837500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
254
250
260
270
280
290
2100
Last modified: 2016-08-31T10:09:14+00:00