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 A258743 #6 Jun 11 2015 09:39:06 %S A258743 1,4,6,9,12,13,14,18,21,24,25,26,29,33,36,39,42,43,44,47,48,51,54,57, %T A258743 58,59,60,61,62,63,66,67,68,72,73,74,78,81,84,85,86,89,93,94,95,99, %U A258743 102,103,104,105,108,109,110,111,114,117,118,119,123,124,125,128,131,134,138,141,144,145,146,149,150,151,152,153 %N A258743 Fixed points in A055266. %C A258743 Numbers n such that A055266(n) = n. %o A258743 (PARI) v=[0]; k=1; while(#v<=10^3, if(!isprime(k+v[#v])&&!vecsearch(vecsort(v), k), v=concat(v, k); if(k==#v-1,print1(k,", ")); k=0); k++); %Y A258743 Cf. A100208, A181730. %K A258743 nonn %O A258743 1,2 %A A258743 _Derek Orr_, Jun 08 2015