is 2 4087403 - 1
has 1230431 decimal digits
takes 0.510 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0F74D596767BE71Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2677.269667.1642%12000023400000.04363.1386%7.313268.1948%1.0306%
PrimeNet2610.075263.9344%170003200000.00612.7779%0.081264.9363%1.0019%
GPU722651.784966.1538%220004000000.00771.8076%1.792666.7656%0.6118%
Difference+2+5.4847+1.0103%+98000+1940000+0.0359+1.3310%+5.5206+1.4291%+1.4291%

Known prime factors (1 factor, 72.2 bits, 0.00176758% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
408740356081626656172762155432272.248686030061828657
3 × 7 × 13 × 19 × 3469 × 38126119
2016-04-04346938126119273.330.37630.7016

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-21T19:45:00Carsten Kossendeydurandal20000300000---0.006--1.214%
2011-07-29T23:40:00harleeP4_260040000580000---0.013--1.773%
2013-07-22T13:41:00Squeeky_SquirrelP4_26001200002340000---0.044--3.139%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-25T00:00:00ANONYMOUSv4_computers21261--0.075--
2010-11-09T13:31:00Grant McCrackenthumper261262--0.075--
2011-07-01T19:13:00GrunwalderGIMPManual testing21263--0.390--
2016-02-23T16:29:48Mark RoseManual testing262263--0.240--
2013-08-29T11:33:00JayderManual testing263264--0.480--
2013-11-01T12:14:00David CampeauManual testing264265--0.914--
2015-05-23T23:25:00snme2pm1Manual testing265266--1.828--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.627 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.627 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.085
50000500000030.542


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-07T00:00:00ANONYMOUSv4_computers0F74D596767BE71C0.510


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-13T16:44:26kkmrkkblmbrbkc4.xlarge
5608162665617276215543
107B6F9D0169BB__no
2018-01-11T16:22:37Oliver KruseGTX-6
5608162665617276215543
107B6F9D0169BB__no


P-1 factor-bounds graph:
B1 = 120000, B2 = 2340000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 40000, B2 = 580000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
B1 = 20000, B2 = 300000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-01-11T16:22:37+00:00