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 A033659 #14 Jul 22 2025 15:33:38 %S A033659 27,99,198,1089,10890,20691,40293,79497,158994,658845,1207701,2284722, %T A033659 4559544,9019098,17928207,88211178,175322466,839546037,1570191975, %U A033659 7362102726,13634115363,49985258994,99970517988 %N A033659 Trajectory of 27 under map x->x + (x-with-digits-reversed). %H A033659 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %Y A033659 Essentially the same as A033651. %K A033659 nonn,base %O A033659 0,1 %A A033659 _N. J. A. Sloane_