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 A268597 #8 Feb 27 2016 11:13:46
%S A268597 1,4,9,8,25,18,15,16,21,50,35,36,33,98,39,32,65,54,51,100,45,70,95,72,
%T A268597 69,338,63,196,161,110,87,64,93,130,75,108,217,182,99,200,185,170,123,
%U A268597 140,117,190,215,144,141,250,235
%N A268597 Smallest x such that x-1 mod phi(x) = n, or 0 if no such x exists.
%C A268597 Conjecture: a(n) > 0 for all n.
%o A268597 (PARI) a(n) = {my(x = 1); while ((x-1) % eulerphi(x) != n, x++); x;} \\ _Michel Marcus_, Feb 27 2016
%Y A268597 Cf. A215486.
%K A268597 nonn
%O A268597 0,2
%A A268597 _Christina Steffan_, Feb 08 2016