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 A277727 #6 Oct 30 2016 13:38:58 %S A277727 0,1,3,5,6,7,9,10,11,12,13,14,16,18,20,22,23,24,25,27,29,30,31,33,34, %T A277727 36,37,38,40,42,43,44,45,47,49,50,51,53,54,55,56,57,58,60,62,64,66,67, %U A277727 68,69,71,73,74,75,77,79,80,81,82,84,86,87,88,90,91,93,94,95,97,98,99,101,103,104,105,106 %N A277727 Union of A158919, A277722, A277723. %C A277727 See A277728 for discussion. %Y A277727 Cf. A003144, A003145, A003146, A058265, A158919, A275926, A276799, A276800, A277722, A277723, A277724, A277725, A277726, A277727, A277728. %K A277727 nonn %O A277727 1,3 %A A277727 _N. J. A. Sloane_, Oct 30 2016