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 A209885 #6 Mar 30 2012 17:30:05 %S A209885 1,3,6,8,12,14,17,19,23,25,28,30,32,35,37,41,43,46,48,52,54,57,59,63, %T A209885 65,68,70,72,75,77,81,83,86,88,92,94,97,99,103,105,109,111,114,116, %U A209885 120,122,125,127,131,133,136,138,142,144,148,150,153,155,159,161 %N A209885 Numbers such that A172470(n) = 9. %Y A209885 Cf. A172470. %K A209885 nonn %O A209885 1,2 %A A209885 _Stephen Crowley_, Mar 14 2012