%I A043687
%S A043687 2,4,5,6,8,9,11,12,13,14,16,17,19,23,24,25,27,28,29,30,32,33,
%T A043687 35,39,47,48,49,51,55,56,57,59,60,61,62,64,65,67,71,79,95,96,
%U A043687 97,99,103,111,112,113,115,119,120,121,123,124,125,126,128,129
%N A043687 a(n)=(s(n)-1)/2, where s(n) = n-th number whose base 2 representation 
               has exactly 3 runs.
%Y A043687 Sequence in context: A035063 A004128 A023717 this_sequence A087118 A039032 
               A000062
%Y A043687 Adjacent sequences: A043684 A043685 A043686 this_sequence A043688 A043689 
               A043690
%K A043687 nonn,base
%O A043687 1,1
%A A043687 Clark Kimberling (ck6(AT)evansville.edu)