%I A089648
%S A089648 0,1,2,4,5,6,9,10,12,17,18,19,20,21,22,24,25,26,28,35,37,38,41,42,44,49,
%T A089648 50,52,56,67,69,70,71,73,74,75,76,77,78,81,82,83,84,85,86,88,89,90,92,
%U A089648 97,98,99,100,101,102,104,105,106,108,112,113,114,116,120,135,139
%N A089648 Numbers whose numbers of 0's and 1's in binary representation differ 
               at most by 1.
%C A089648 A031443 is a subsequence; abs(A037861(a(n)))<=1.
%H A089648 <a href="Sindx_Bi.html#binary">Index entries for sequences related to 
               binary expansion of n</a>
%H A089648 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               DigitCount.html">Digit Count</a>
%Y A089648 Cf. A023416, A000120.
%Y A089648 Sequence in context: A132791 A125297 A143072 this_sequence A062861 A120629 
               A015834
%Y A089648 Adjacent sequences: A089645 A089646 A089647 this_sequence A089649 A089650 
               A089651
%K A089648 nonn,base
%O A089648 1,3
%A A089648 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 02 2004