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 A276784 #7 Oct 03 2016 16:14:30 %S A276784 1,2,5,8,9,10,11,12,15,20,21,24,25,26,27,28,31,32,35,36,37,38,41,46, %T A276784 47,50,51,52,54,56,57,60,63,65,66,69,70,72,73,74,75,78,79,82,83,86,87, %U A276784 90,91,96,97,98,99,101,103,104,106,108,109,111,114,116,117,120,123,125,128,129,130,132,133,136,139,140,141,144,145,148,149,150,151,153,155 %N A276784 Complement of A276783. %H A276784 N. J. A. Sloane, <a href="/A276784/b276784.txt">Table of n, a(n) for n = 1..11609</a> %Y A276784 Cf. A275901, A275902, A276783. %K A276784 nonn %O A276784 1,2 %A A276784 _N. J. A. Sloane_, Oct 03 2016