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 A033038 #11 Feb 14 2014 01:45:55 %S A033038 1,3,5,7,9,11,14,16,18,20,22,24,40,42,44,46,48,50,66,68,70,72,74,76, %T A033038 92,94,96,98,100,102,118,120,122,124,126,128,144,146,148,150,152,154, %U A033038 183,185,187,189,191,193,209,211,213,215,217,219 %N A033038 Numbers all of whose base 13 digits are odd. %t A033038 Select[Range[250],And@@OddQ[IntegerDigits[#,13]]&] (* _Harvey P. Dale_, Jun 17 2011 *) %K A033038 nonn,base %O A033038 1,2 %A A033038 _Clark Kimberling_