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 A184010 #7 Mar 30 2012 18:57:13
%S A184010 1,3,4,6,7,8,9,11,12,13,14,15,17,18,19,20,21,22,23,25,26,27,28,29,30,
%T A184010 31,32,34,35,36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52,53,54,55,
%U A184010 57,58,59,60,61,62,63,64,65,66,67,68,69,71,72,73,74,75,76,77,78,79,80,81,82,83,84,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,103,104,105,106,107,108,109,110,111
%N A184010 n + floor(sqrt(-1+4n/3)); complement of A001859 (except for initial zero).
%F A184010 a(n) = n + floor(sqrt(-1+4n/3))
%t A184010 a=4/3; b=-1; Table[n+Floor[(a*n+b)^(1/2)],{n,100}]
%Y A184010 Cf. A001859.
%K A184010 nonn,easy
%O A184010 1,2
%A A184010 _Clark Kimberling_, Jan 08 2011