is 2 9157873 - 1
has 2756795 decimal digits
takes 2.531 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LFCEF66B4645B13E3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.244664.1791 %11000020350000.08613.3671 %3.330765.3852 %
Target2686.508664.7059 %6000065000000.16472.4065 %6.673365.5552 %
Difference-1-3.2640-0.5268 %+50000-4465000-0.0785+0.9606%-3.3425-0.1700 %

Known prime factors (1 factor, 68.2 bits, 0.00074503% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
91578733458541468638866500492168.22918882886171488
25 × 3 × 61 × 131 × 24614783
2014-04-26131246147836.50860.53751.0038

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-06-06Carsten Kossendeymother500007625006--0.0382.022%
2012-08-27NesowaOutback11000020350006--0.0863.005%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-17ANONYMOUSv4_computers212620.034
1999-04-13ANONYMOUSv4_computers212640.214
2013-09-14NesowaManual testing2642650.408


ECM factoring results:
Total ECM effort:0.420 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.420


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-08-10ANONYMOUSv4_computersFCEF66B4645B13E32.531
2003-03-16ANONYMOUSv4_computersFCEF66B4645B13E32.531


PRP results:
dateuseridcompidcofactorsres64
2019-07-08treborLaptop
345854146863886650049
6838ADC636D15997
2020-10-26kutensspica
345854146863886650049
6838ADC636D15997


CERT results:
dateuseridcompid
2020-10-26Ben Deloi-0d663cba28f36914e


P-1 factor-bounds graph:
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 50000, B2 = 762500 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
265
264
262
this exponent TF target: 68
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-03T02:29:32+00:00