is 2 9645221 - 1
has 2903501 decimal digits
takes 2.813 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LE882CA0482BB1D49double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.080764.1791 %17000034850000.14834.0749 %3.229065.6388 %
Target2686.179764.7059 %6000070000000.18532.4699 %6.365065.5776 %
Difference-1-3.0990-0.5268 %+110000-3515000-0.0370+1.6050%-3.1360+0.0612 %

Known prime factors (1 factor, 66.5 bits, 0.00068955% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
96452211049712586951751579212166.5095441620191760
24 × 5 × 68020252397
2014-11-2916680202523971.53121,567.32,927.3

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-07-12RonnyKarlv4_computers130000130000--0.0551.216%
2011-11-21James HeinrichQ660017000034850006--0.1483.660%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-05-23ANONYMOUSv4_computers212640.204
2011-10-31James HeinrichManual testing2642650.387


ECM factoring results:
Total ECM effort:0.444 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.444


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-09-08RonnyKarlv4_computersE882CA0482BB1D492.813
2003-09-21ANONYMOUSv4_computersE882CA0482BB1D492.813


PRP results:
dateuseridcompidcofactorsres64
2019-10-07mnd975202b
104971258695175157921
A0701C38BA22AFCD
2020-12-18kutenssol
104971258695175157921
A0701C38BA22AFCD


CERT results:
dateuseridcompid
2020-12-18curtiscwcm220a-17l


P-1 factor-bounds graph:
B1 = 170000, B2 = 3485000 (P-1 stage 2)
B1 = 170000 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
265
264
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
250
260
270
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Last modified: 2024-02-29T14:28:04+00:00