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 A070793 #10 Oct 21 2019 02:35:28
%S A070793 9,18,27,36,45,54,63,72,81,90,99,198,297,396,495,594,693,792,891,990,
%T A070793 1017,1035,1044,1089,1107,1125,1134,1179,1215,1224,1269,1305,1314,
%U A070793 1359,1404,1449,1539,1629,1719,1809,1899,1989,2016,2034,2043,2088,2106,2124
%N A070793 Integers n such that the 'Reverse and Add!' trajectory of n joins the trajectory of 9.
%H A070793 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%e A070793 The trajectory of 18 is part of the trajectory of 9; the trajectory of 1215 joins the trajectory of 9 at 40293 after 3 steps.
%t A070793 limit = 10^3; x = NestList[ # + IntegerReverse[#] &, 9, limit];
%t A070793 Select[Range[2124],
%t A070793 Intersection[NestList[ # + IntegerReverse[#] &, #, limit],
%t A070793 x] != {} &] (* _Robert Price_, Oct 20 2019 *)
%Y A070793 Cf. A070788 - A070792, A070794 - A070798, A063049.
%K A070793 base,nonn
%O A070793 1,1
%A A070793 _Klaus Brockhaus_, May 07 2002