is 2 13879109 - 1
has 4178029 decimal digits
takes 6.158 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LDDA1AEBF11112514double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2672.140964.1791 %50000032070885011.545210.0033 %13.686167.7624 %
Target2698.601965.2174 %90000110000000.44032.7940 %9.042266.1892 %
Difference-2-6.4610-1.0383 %+410000+309708850+11.1049+7.2093%+4.6439+1.5732 %

Known prime factors (1 factor, 85.1 bits, 0.00061346% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13879109427084724051856097626011592685.1431538588406690429831
33 × 11 × 19 × 3257 × 6389 × 13102729
2016-09-19638913102729673,4520.46310.8578

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-03-16ANONYMOUSv4_computers1750003981250--0.2463.569%
2023-10-26nordisweet16_30.8b14500000500000--0.3472.137%
2023-11-03nordisweet16_30.8b14500000320708850
skipped known factor: 42708472405185609762601159
--14.828.453%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-07-25lalerav4_computers212560.001
2000-08-10ANONYMOUSv4_computers212650.269
2014-07-08NesowaManual testing2652660.538
2015-09-06NesowaManual testing2662671.077


ECM factoring results:
Total ECM effort:0.728 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-03-24ANONYMOUSv4_computersDDA1AEBF111125146.158
2005-04-11jfandrev4_computersDDA1AEBF111125146.158


PRP results:
dateuseridcompidcofactorsres64
2022-10-28Perigbreagan
42708472405185609762601159
422574F8FFA1ABC7


CERT results:
dateuseridcompid
2022-10-28Massimo Cappelli (ik5pwa)maxlinux_5


P-1 factor-bounds graph:
B1 = 500000, B2 = 320708850 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 175000, B2 = 3981250 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
256
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
250
260
270
280
290
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00