Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #26 May 05 2014 05:02:41
%S 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 28,29,30,31,32,34,35,36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52,
%U 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 Numbers in which the two leading (most significant) digits are distinct.
%C More than the usual number of terms are displayed in order to show the difference from some closely-related sequences.
%H Reinhard Zumkeller, <a href="/A241158/b241158.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a241158 n = a241158_list !! (n-1)
%o a241158_list = filter (f . show) [0..] where
%o f [_] = True; f (d : d' : _) = d /= d'
%o -- _Reinhard Zumkeller_, May 02 2014
%Y Cf. A010784, A043096, A241157.
%K nonn,base
%O 1,3
%A _N. J. A. Sloane_, Apr 18 2014