is 21642787-1
has 494,529 decimal digits
takes 0.073 GHz-days to do one L-L test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-L2D0E26B5A67B0E76double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2630.971566.6667%1,000,00040,000,0000.20249.1078%1.173975.7745%12.6166%
PrimeNet2570.011763.1579%7,000120,0000.00092.5613%0.012565.7192%2.5613%
GPU722610.187065.5738%6,50080,0000.00071.1710%0.187766.7447%1.1710%
Difference+2+0.7845+1.0929%+993,500+39,920,000+0.2017+7.9369%+0.9862+9.0297%+9.0297%

Known prime factors (1 factor, 70.8 bits, 0.00431196% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
164278721079355217627500294812270.836641572985957020
22 × 5 × 13 × 2311 × 2633 × 405529
2,633405,5292012-02-10146.710.00160.0027

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-10T10:06:00AxonManual testing100,000100,000---0.006--1.529%
2012-02-10T10:06:00AxonManual testing200,000200,000---0.013--2.132%
2012-02-10T10:06:00AxonManual testing300,000300,000---0.019--2.538%
2012-02-10T10:07:00AxonManual testing400,000400,000---0.026--2.850%
2012-02-10T10:07:00AxonManual testing500,000500,000---0.032--3.105%
2012-02-10T10:07:00AxonManual testing600,000600,000---0.039--3.322%
2012-02-10T10:07:00AxonManual testing700,000700,000---0.045--3.511%
2012-02-10T10:08:00AxonManual testing800,000800,000---0.052--3.679%
2012-02-10T10:08:00AxonManual testing900,000900,000---0.058--3.831%
2012-02-10T10:08:00AxonManual testing1,000,0001,000,000---0.065--3.969%
2012-02-10T10:08:00AxonManual testing1,000,0008,000,000---0.089--6.857%
2012-02-10T10:09:00AxonManual testing1,000,00016,000,000---0.118--7.826%
2012-02-10T10:09:00AxonManual testing1,000,00024,000,000---0.146--8.394%
2012-02-10T10:09:00AxonManual testing1,000,00032,000,000---0.174--8.796%
2012-02-10T10:09:00AxonManual testing1,000,00040,000,000---0.202--9.108%
2016-03-17T19:17:46alpertronManual testing500,00015,000,00012---0.084--7.307%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers?257--0.012--
2003-06-01T00:00:00ANONYMOUSv4_computers?258--0.023--
2010-04-30T14:20:00For Researchm1_76l260261--0.093--
2010-07-30T00:04:00GrunwalderGIMPManual testing21263--0.972--


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_computers2D0E26B5A67B0E760.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T17:11:23Oliver KruseGTX-2
2107935521762750029481
BFA30F08788DDD__no
2017-11-02T03:02:08ATHec2-1xf
2107935521762750029481
BFA30F08788DDD__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 = 1,000,000, B2 = 8,000,000 (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)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-11T13:13:35+00:00