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 A257047 #5 Apr 15 2015 04:57:02 %S A257047 0,2,3,4,6,7,9,11,12,13,15,16,18,19,20,22,23,25,27,28,29,31,32,34,36, %T A257047 38,39,40,42,43,45,47,48,49,51,52,53,55,56,58,60,61,62,64,66,67,68,70, %U A257047 71,73,75,76,77,79,80,81,83,84,85,87,88,90,92,93,94,96 %N A257047 Numbers not having trace 1 in their enhanced squares representation, see A256913. %C A257047 A256914(a(n)) != 1. %H A257047 Reinhard Zumkeller, <a href="/A257047/b257047.txt">Table of n, a(n) for n = 1..10000</a> %o A257047 (Haskell) %o A257047 a257047 n = a257047_list !! (n-1) %o A257047 a257047_list = filter ((/= 1) . a256914) [0..] %Y A257047 Cf. A256913, A256914, A257046 (complement). %K A257047 nonn %O A257047 1,2 %A A257047 _Reinhard Zumkeller_, Apr 15 2015