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 A189224 #7 Feb 12 2018 16:45:53 %S A189224 1,2,3,5,6,9,10,11,15,17,18,19,20,23,27,30,31,32,33,35,37,38,41,43,45, %T A189224 50,51,53,54,57,58,59,60,62,65,68,69,70,71,73,77,81,82,83,90,91,93,94, %U A189224 95,96,98,99,100,105,107,110,111,112,113,114,116,118,119,123,125,127,128,129,130,131 %N A189224 Positions of 1 in A189222; complement of A189223. %H A189224 Ivan Neretin, <a href="/A189224/b189224.txt">Table of n, a(n) for n = 1..10000</a> %t A189224 (See A189222.) %Y A189224 Cf. A189222, A189223. %K A189224 nonn %O A189224 1,2 %A A189224 _Clark Kimberling_, Apr 18 2011