is 2 8078663 - 1
has 2431920 decimal digits
takes 2.109 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA04AB772D5F1B0AFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2687.378166.1765 %10000019500000.07602.8723 %7.454167.1480 %
Target2673.678165.6716 %5500060000000.14352.5708 %3.821566.5542 %
Difference+1+3.7000+0.5048 %+45000-4050000-0.0674+0.3014%+3.6326+0.5938 %

Known prime factors (1 factor, 96.2 bits, 0.00119111% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8078663926234709598391274907927239432996.2255732599005543313756917
32 × 79 × 1931 × 4175415407904137
2019-03-23193141754154079041371.986e+986,129,541160,865,997

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-07-27lozcsv4_computers4000040000--0.0150.676%
2011-06-06James HeinrichWHS10000019500006--0.0763.223%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-24ANONYMOUSv4_computers212610.019
1998-11-07ANONYMOUSv4_computers212620.038
1999-05-02ANONYMOUSv4_computers212630.122
2013-09-15AxelssonManual testing2632640.243
2013-12-25David CampeauManual testing2642650.462
2015-04-30snme2pm1Manual testing2652660.925
2015-11-23snme2pm1Manual testing2662671.850
2018-07-03chuenkitManual testing2672683.700
2018-07-04ramgeisManual testing267268


ECM factoring results:
Total ECM effort:1.588 GHz-days
Estimated T-Level:0.769
DigitsB1CompleteFacMiss
20110000.15485.740%
25500000.01498.587%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.191
50000500000010.397


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-08ANONYMOUSv4_computersA04AB772D5F1B0AF2.109
2002-08-24lozcsv4_computersA04AB772D5F1B0AF2.109


PRP results:
dateuseridcompidcofactorsres64
2019-03-24treborLaptop
92623470959839127490792723943
A663D0572921798C
2020-01-27Luigi MorelliCS50X-C9
92623470959839127490792723943
A663D0572921798C


CERT results:
No CERT results for M8078663


P-1 factor-bounds graph:
B1 = 100000, B2 = 1950000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
TF factor-bounds graph:
268
267
266
265
264
263
262
261
this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=0.77 ~= -14-bit
250
260
270
280
290
2100
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Last modified: 2024-02-09T03:30:02+00:00