is 21646261-1
has 495,574 decimal digits
takes 0.074 GHz-days to do one L-L test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-L75574C87C9735685double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2630.969566.6667%1,000,00040,000,0000.20249.1098%1.171975.7765%12.6186%
PrimeNet2570.011763.1579%7,000120,0000.00092.5623%0.012565.7202%2.5623%
GPU722610.186665.5738%6,50080,0000.00071.1715%0.187366.7453%1.1715%
Difference+2+0.7829+1.0929%+993,500+39,920,000+0.2017+7.9383%+0.9846+9.0312%+9.0312%

Known prime factors (1 factor, 75.5 bits, 0.00458884% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
1646261550917889300739089285432375.54416732398122191411
11 × 17 × 149 × 477637 × 1257281
477,6371,257,2812012-02-137,093.90.03370.0630

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-13T10:06:00AxonManual testing100,000100,000---0.006--1.530%
2012-02-13T10:06:00AxonManual testing200,000200,000---0.013--2.133%
2012-02-13T10:06:00AxonManual testing300,000300,000---0.019--2.539%
2012-02-13T10:06:00AxonManual testing400,000400,000---0.026--2.851%
2012-02-13T10:07:00AxonManual testing500,000500,000---0.032--3.106%
2012-02-13T10:07:00AxonManual testing600,000600,000---0.039--3.322%
2012-02-13T10:07:00AxonManual testing700,000700,000---0.045--3.512%
2012-02-13T10:07:00AxonManual testing800,000800,000---0.052--3.680%
2012-02-13T10:07:00AxonManual testing900,000900,000---0.058--3.832%
2012-02-13T10:08:00AxonManual testing1,000,0001,000,000---0.065--3.970%
2012-02-13T10:08:00AxonManual testing1,000,00016,000,000---0.118--7.828%
2012-02-13T10:08:00AxonManual testing1,000,00024,000,000---0.146--8.395%
2012-02-13T10:08:00AxonManual testing1,000,00032,000,000---0.174--8.798%
2012-02-13T10:08:00AxonManual testing1,000,00040,000,000---0.202--9.110%
2016-03-17T19:17:50alpertronManual testing500,00015,000,00012---0.084--7.309%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers?257--0.012--
2003-05-26T00:00:00ANONYMOUSv4_computers?258--0.023--
2010-04-29T04:30:00For Researchm1_76l260261--0.093--
2010-08-03T22:36:00GrunwalderGIMPManual testing21263--0.969--


ECM factoring results:
ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50,0005,000,00025114.11


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers75574C87C97356850.074


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T17:49:06Oliver KruseGTX-3
55091788930073908928543
E902CC0369FE8A__no
2017-11-02T06:07:53Chang Chia-Tchehomura
55091788930073908928543
E902CC0369FE8A__no


P-1 factor-bounds graph:
B1 = 1,000,000, B2 = 40,000,000 (stage 2)
B1 = 1,000,000, B2 = 32,000,000 (stage 2)
B1 = 1,000,000, B2 = 24,000,000 (stage 2)
B1 = 1,000,000, B2 = 16,000,000 (stage 2)
B1 = 500,000, B2 = 15,000,000 (stage 2)
B1 = 1,000,000 (stage 1)
B1 = 900,000 (stage 1)
B1 = 800,000 (stage 1)
B1 = 700,000 (stage 1)
B1 = 600,000 (stage 1)
B1 = 500,000 (stage 1)
B1 = 400,000 (stage 1)
B1 = 300,000 (stage 1)
B1 = 200,000 (stage 1)
B1 = 100,000 (stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:51:22+00:00