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 A180704 #6 Jan 17 2016 13:55:23 %S A180704 0,13,2,22,3,7,19,31,39,4,8,16,24,28,36,40,44,1,9,13,17,21,72,25,29, %T A180704 33,37,135,41,45,143,2,53,6,10,155,14,112,18,116,22,120,26,171,30,222, %U A180704 34,273,85,38,183,42,281,93,46,238,97,3,195,54,7,199,58,11,250,109,15,301 %N A180704 18^a(n) is smallest power of 18 beginning with n. %H A180704 D. Mondot, <a href="/A180704/b180704.txt">Table of n, a(n) for n=1..32699</a> %Y A180704 Cf. A180702, A180703, A180706 %K A180704 base,nonn %O A180704 1,2 %A A180704 _Daniel Mondot_, Sep 18 2010