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 A277600 #4 Dec 03 2016 11:51:53
%S A277600 3,8,13,18,23,28,30,33,38,43,48,53,58,63,68,73,78,80,83,88,93,98,103,
%T A277600 108,113,118,123,128,130,133,138,143,148,153,158,163,168,173,178,180,
%U A277600 183,188,193,198,203,208,213,218,223,228,230,233,238,243,248,253
%N A277600 (1/2)*A277593.
%H A277600 Clark Kimberling, <a href="/A277600/b277600.txt">Table of n, a(n) for n = 1..10000</a>
%t A277600 z = 260; a[b_] := Table[Mod[n/b^IntegerExponent[n, b], b], {n, 1, z}]
%t A277600 p[b_, d_] := Flatten[Position[a[b], d]]
%t A277600 p[10, 2]/2 (* A277597 *)
%t A277600 p[10,4]/3 (* A277598 *)
%t A277600 p[10,5]/5 (* A277599 *)
%t A277600 p[10,6]/2 (* A277600 *)
%t A277600 p[10,8]/2 (* A277601 *)
%Y A277600 Cf. A277593, A277597, A277598, A277599, A277601.
%K A277600 nonn,easy
%O A277600 1,1
%A A277600 _Clark Kimberling_, Nov 12 2016