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 A070797 #11 Oct 21 2019 02:35:00
%S A070797 108,126,144,153,162,171,180,189,207,225,243,252,261,270,279,288,306,
%T A070797 324,342,351,360,378,387,405,423,441,450,477,486,504,522,540,549,576,
%U A070797 585,603,621,648,675,684,702,720,747,774,783,801,846,873,882,900,909
%N A070797 Integers n such that the 'Reverse and Add!' trajectory of n joins the trajectory of 108.
%C A070797 It appears that the first differences of this sequence are always a multiple of 9. - _Robert Price_, Oct 20 2019
%H A070797 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%e A070797 The trajectory of 909 is part of the trajectory of 108; the trajectory of 126 joins the trajectory of 108 at 4069593 after 12 steps.
%t A070797 limit = 10^3; x = NestList[ # + IntegerReverse[#] &, 108, limit];
%t A070797 Select[Range[909],
%t A070797 Intersection[NestList[ # + IntegerReverse[#] &, #, limit],
%t A070797 x] != {} &] (* _Robert Price_, Oct 20 2019 *)
%Y A070797 Cf. A070788 - A070796, A070798, A063049.
%K A070797 base,nonn
%O A070797 1,1
%A A070797 _Klaus Brockhaus_, May 07 2002