%I #4 Jul 12 2012 00:39:48
%S 1,2,4,6,7,10,11,12,15,17,18,20,21,24,25,28,29,30,33,34,35,38,40,41,
%T 43,46,47,48,50,52,54,56,57,58,61,63,65,66,68,70,71,74,76,77,79,80,82,
%U 84,86,88,89,92,93,94,96,98,100,102,104,106,107,109,111,112,115,116,117
%N a(n)=least positive integer not a(k) or a(k)+floor(k/2) for any k<n.
%e Let b(n)=n-th positive integer of the form a(k)+floor(k/2). Clearly a(1)=1, so b(1)=1, so a(2)=2, so b(2)=3, so a(3)=4 and so on.
%Y Cf. A102529, A102530.
%K nonn
%O 1,2
%A _Clark Kimberling_, Jan 13 2005