is 2 8183587 - 1
has 2463506 decimal digits
takes 2.137 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L12D29B63D1D41EF6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.630965.6716%21500054287500.18894.5127%3.819967.2208%1.5491%
PrimeNet2630.195063.4921%360009000000.03153.6187%0.226564.8132%1.3211%
GPU722673.630965.6716%5500013000000.04652.6256%3.677466.5730%0.9013%
Difference---+160000+4128750+0.1424+1.8871%+0.1424+0.6478%+0.6478%

Known prime factors (1 factor, 71.3 bits, 0.00087136% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
818358729242752922619361466092271.309178667086465992
23 × 3 × 12791 × 582007813
2013-03-061279158200781363.88412.01022.423

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-10T00:00:00ANONYMOUSv4_computers40000440000---0.023--1.851%
2012-09-30T19:52:00James Heinrichi7-9202150005428750---0.189--4.513%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-20T00:00:00ANONYMOUSv4_computers21263--0.195--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-29T00:00:00ANONYMOUSv4_computers12D29B63D1D41EF62.137
2002-09-22T00:00:00ANONYMOUSv4_computers12D29B63D1D41EF62.137


PRP results:
dateuseridcompidcofactorsres64PRP
2018-09-10T06:21:56Oliver KruseGTX-5
2924275292261936146609
C79204471A4A8A__no
2020-02-29T01:04:20ATHec2-PRPCFDC
2924275292261936146609
C79204471A4A8AC6no


P-1 factor-bounds graph:
B1 = 215000, B2 = 5428750 (P-1 stage 2)
B1 = 215000 (P-1 stage 1)
B1 = 40000, B2 = 440000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
103
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105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
250
260
270
280
290
2100
Last modified: 2020-02-29T01:04:20+00:00