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 A180726 #6 Jan 17 2016 14:13:42 %S A180726 0,1,5,2,9,6,46,3,53,10,50,7,17,47,77,4,34,54,84,1,31,51,61,81,8,18, %T A180726 38,48,68,78,98,5,25,35,45,55,75,85,95,2,22,32,42,145,52,62,72,82,92, %U A180726 102,9,19,29,39,142,49,59,162,69,79,89,192,99,6,16,119,26,36,139,46,149,56,66 %N A180726 20^a(n) is smallest power of 20 beginning with n. %H A180726 D. Mondot, <a href="/A180726/b180726.txt">Table of n, a(n) for n=1..32699</a> %Y A180726 Cf. A180706, A180725, A180728 %K A180726 base,nonn %O A180726 1,3 %A A180726 _Daniel Mondot_, Sep 18 2010