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 A033652 #20 Jul 08 2025 19:54:26
%S A033652 13,44,88,176,847,1595,7546,14003,44044,88088,176176,847847,1596595,
%T A033652 7553546,14007103,44177144,88354288,176599676,853595347,1597190705,
%U A033652 6668108656,13236127322,35608290553,71117571206
%N A033652 Trajectory of 13 under map x->x + (x-with-digits-reversed).
%C A033652 To get the next term, reverse the present term and add it to itself.
%H A033652 Alois P. Heinz, <a href="/A033652/b033652.txt">Table of n, a(n) for n = 0..1000</a>
%H A033652 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%F A033652 a(n+1) = a(n) + {a(n) reversed}.
%e A033652 44 = 13 + 31.
%t A033652 NestList[#+FromDigits[Reverse[IntegerDigits[#]]]&,13,30] (* _Harvey P. Dale_, Mar 04 2015 *)
%Y A033652 Row n=13 of A243238.
%K A033652 nonn,base
%O A033652 0,1
%A A033652 _N. J. A. Sloane_