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 A189725 #4 Mar 30 2012 18:57:25 %S A189725 2,3,4,6,7,9,10,12,14,15,16,18,19,21,23,24,25,27,28,30,32,33,34,36,38, %T A189725 39,40,42,43,45,46,48,50,51,52,54,55,57,59,60,61,63,65,66,67,69,70,72, %U A189725 73,75,77,78,79,81,82,84,86,87,88,90,92,93,94,96,97,99,100,102,104,105,106,108,110,111,112,114,115,117,118,120,122,123,124,126 %N A189725 Positions of 1 in A189723; complement of A189724. %C A189725 (See A189723.) %t A189725 (See A189723.) %Y A189725 Cf. A189723, A189724, A189726. %K A189725 nonn %O A189725 1,1 %A A189725 _Clark Kimberling_, Apr 26 2011