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 A180698 #6 Jan 17 2016 13:54:45 %S A180698 0,2,3,15,4,16,5,11,17,57,6,12,86,18,1,24,7,47,13,87,36,2,93,42,8,116, %T A180698 65,31,14,105,71,37,3,128,94,60,26,9,134,100,66,49,15,140,123,106,72, %U A180698 55,21,4,129,112,95,78,44,27,10,152,135,101,84,67,50,33,16,158,141,124,107 %N A180698 15^a(n) is smallest power of 15 beginning with n. %H A180698 D. Mondot, <a href="/A180698/b180698.txt">Table of n, a(n) for n=1..32699</a> %Y A180698 Cf. A180696, A180697, A180700 %K A180698 base,nonn %O A180698 1,2 %A A180698 _Daniel Mondot_, Sep 18 2010