2017-10-06, 09:12 | #1 |
(loop (#_fork))
Feb 2006
Cambridge, England
18F0_{16} Posts |
3-brilliant
Code:
10^85 + 107473 = 12347174190853644923628605843 * 18988823498425240613108727011 * 42651505675667342634613401401 I think this is new; at least it's not on https://www.alpertron.com.ar/BRILLIANT3.HTM#min3br This is an exercise in data management and figuring out good points to switch ECM levels; took about two CPU-weeks which were mostly spent in the final msieve jobs to finish the gaps; the data management is helped by noticing that you can recover n from p (as p-lift(Mod(10,p)^85) so don't need to maintain the matching except when compiling the final table. I am most of the way through doing the same thing for 10^88+n Last fiddled with by fivemack on 2017-10-06 at 09:20 |
2017-10-09, 15:46 | #2 |
Sep 2009
3^{2}×227 Posts |
Factoring (4762271^19-1)/2999339555510 produced:
Code:
p39 factor: 104426665673144738814918007495550408497 p39 factor: 131594475136416936581040193488397035331 p39 factor: 183397454399731007619541358534329559279 Chris |
2017-10-11, 08:58 | #3 |
(loop (#_fork))
Feb 2006
Cambridge, England
2^{4}·3·7·19 Posts |
10^85 - 224621 =
Code:
16590231029548214398579319783 * 21620099167674771100153066907 * 27879814796486104536348179759 |
2017-10-11, 20:09 | #4 |
(loop (#_fork))
Feb 2006
Cambridge, England
1100011110000_{2} Posts |
10^88 - 697107 =
Code:
112582261378919338123979183167 * 120894766377814164001721854681 * 734721133070772150681018962059 |
2017-11-02, 22:36 | #5 |
(loop (#_fork))
Feb 2006
Cambridge, England
6384_{10} Posts |
Code:
10^100 - 3302127 = 1081699593131182743410694185335271 * 2147178415105826474267811749381803 * 4305515935360678535609171490104021 I'd send this to alpertron, but I haven't heard back about the previous ones I've sent there. One oddity when doing this: 10^50 + 1623 and 10^50 - 1623 are both prime, so 10^100-2634129 survived lots of ECM, and failed (sieving giving a yield of zero) when I tried SNFS with the reducible polynomial x^4-1623^2. Last fiddled with by fivemack on 2017-11-02 at 22:40 |
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