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 A277574 #4 Nov 07 2016 09:13:33
%S A277574 2,5,8,11,12,14,17,20,23,26,29,30,32,35,38,41,44,47,48,50,53,56,59,62,
%T A277574 65,66,68,71,72,74,77,80,83,84,86,89,92,95,98,101,102,104,107,110,113,
%U A277574 116,119,120,122,125,128,131,134,137,138,140,143,146,149,152
%N A277574 (1/2)*A277570.
%H A277574 Clark Kimberling, <a href="/A277574/b277574.txt">Table of n, a(n) for n = 1..10000</a>
%t A277574 z = 260; a[b_] := Table[Mod[n/b^IntegerExponent[n, b], b], {n, 1, z}]
%t A277574 p[b_, d_] := Flatten[Position[a[b], d]]
%t A277574 p[6, 2]/2 (* A277572 *)
%t A277574 p[6, 3]/3 (* A277573 *)
%t A277574 p[6, 4]/2 (* A277574 *)
%Y A277574 Cf. A277568, A277572, A277573.
%K A277574 nonn,easy
%O A277574 1,1
%A A277574 _Clark Kimberling_, Nov 01 2016