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 A000870 #13 Apr 01 2017 00:33:28
%S A000870 6,7,16,17,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,
%T A000870 79,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615,
%U A000870 616,617,618,619,620
%N A000870 Numbers beginning with letter 's' in English.
%H A000870 John Cerkan, <a href="/A000870/b000870.txt">Table of n, a(n) for n = 1..10000</a>
%t A000870 Select[Range[10^3], Function[d, Or[And[Mod[IntegerLength@ #, 3] == 2, MemberQ[{16, 17}, FromDigits@ Take[d, 2]]], MemberQ[{6, 7}, First@ d]]]@ IntegerDigits@ # &] (* _Michael De Vlieger_, Feb 13 2017 *)
%Y A000870 Subsequence of A125299.
%Y A000870 Cf. A000865, A000867, A000873, A000981, A006092.
%K A000870 word,nonn
%O A000870 1,1
%A A000870 _N. J. A. Sloane_
%E A000870 Edited by _John Cerkan_, Feb 13 2017