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 A033013 #12 Feb 05 2014 03:14:28
%S A033013 16,32,48,64,80,96,112,128,144,160,176,192,208,224,3600,3632,3648,
%T A033013 3664,3680,3696,3712,3728,3744,3760,3776,3792,3808,3824,7200,7216,
%U A033013 7248,7264,7280,7296,7312,7328,7344,7360,7376,7392
%N A033013 Every run of digits of n in base 15 has length 2.
%C A033013 See A043291 and A033001 through A033014 for the analog in other bases, A033015 - A033029 for the variants with run lengths >= 2. - _M. F. Hasler_, Feb 04 2014
%H A033013 Vincenzo Librandi, <a href="/A033013/b033013.txt">Table of n, a(n) for n = 1..2000</a>
%F A033013 a(n) = 16*A043319(n) (= 16n for n<15). - _M. F. Hasler_, Feb 02 2014
%t A033013 Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 15]]]=={2}&] (* _Vincenzo Librandi_, Feb 05 2014 *)
%K A033013 nonn,base
%O A033013 1,1
%A A033013 _Clark Kimberling_