This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A109911 #10 Jan 31 2017 10:08:25 %S A109911 18,27,36,45,54,63,72,81,1098,1188,1278,1368,1458,1548,1638,1728,1818, %T A109911 1908,2097,2187,2277,2367,2457,2547,2637,2727,2817,2907,3096,3186, %U A109911 3276,3366,3456,3546,3636,3726,3816,3906,4095,4185,4275,4365,4455,4545,4635 %N A109911 Numbers n such that A109910(n) = n; that is, the 9's complement of the digit reversal of n is n. %C A109911 Obviously the terms have an even number of digits. a(n) = 0 mod 9. %H A109911 Indranil Ghosh, <a href="/A109911/b109911.txt">Table of n, a(n) for n = 1..20000</a> %e A109911 1728 is a member because its digit reversal is 8271 and 1728+8271 = 9999. %Y A109911 Cf. A109910. %K A109911 base,easy,nonn %O A109911 1,1 %A A109911 _Amarnath Murthy_, Jul 16 2005 %E A109911 More terms from _Erich Friedman_, Aug 08 2005 %E A109911 Corrected and edited. - _David Wasserman_, Oct 28 2008