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 A333523 #16 Apr 11 2020 08:25:10
%S A333523 1,1,1,1,1,1,1,1,1,61,1,3,8,34,22,8,17,2,8,119,14,1,17,7,110,7,12,33,
%T A333523 34,158,28,12,1,60,11,12,50,79,7,129,64,13,42,1,4,89,131,8,14,81,30,
%U A333523 19,125,12,1,88,13,33,67,232,26,27,24,123,59,1,24,59,36,206,148,12,217,90,97
%N A333523 Number of iterations of Reverse And Add needed to reach a number divisible by n (or 0 if such a number is never reached).
%C A333523 If n is a palindrome > 0, a(n) = 1. See A002113.
%C A333523 a(n) > 0 for n < 10000.
%H A333523 Daniel Starodubtsev, <a href="/A333523/b333523.txt">Table of n, a(n) for n = 1..10000</a>
%e A333523 a(12) = 3, because 12 takes 3 iterations (12 -> 33 -> 66 -> 132) to become 132, which is divisible by 12.
%o A333523 (PARI) radd(n) = fromdigits(Vecrev(digits(n)))+n; \\ A056964
%o A333523 a(n) = {my(i=1, k=n, x); while((x=radd(n)) % k, i++; n=x); i;} \\ _Michel Marcus_, Apr 11 2020
%Y A333523 Cf. A002113, A016016, A056964.
%K A333523 nonn,base
%O A333523 1,10
%A A333523 _Daniel Starodubtsev_, Mar 26 2020