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 A241158 #26 May 05 2014 05:02:41 %S A241158 0,1,2,3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19,20,21,23,24,25,26,27, %T A241158 28,29,30,31,32,34,35,36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52, %U A241158 53,54,56,57,58,59,60,61,62,63,64,65,67,68,69,70,71,72,73,74,75,76,78,79,80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,120 %N A241158 Numbers in which the two leading (most significant) digits are distinct. %C A241158 More than the usual number of terms are displayed in order to show the difference from some closely-related sequences. %H A241158 Reinhard Zumkeller, <a href="/A241158/b241158.txt">Table of n, a(n) for n = 1..10000</a> %o A241158 (Haskell) %o A241158 a241158 n = a241158_list !! (n-1) %o A241158 a241158_list = filter (f . show) [0..] where %o A241158 f [_] = True; f (d : d' : _) = d /= d' %o A241158 -- _Reinhard Zumkeller_, May 02 2014 %Y A241158 Cf. A010784, A043096, A241157. %K A241158 nonn,base %O A241158 1,3 %A A241158 _N. J. A. Sloane_, Apr 18 2014