%I #3 Mar 30 2012 16:50:47
%S 3,3,4,4,5,5,5,6,6,7,7,7,8,8,8,9,9,10,10,10,11,11,11,12,12,12,12,13,
%T 13,13,14,14,14,15,15,15,16,16,16,16,17,17,17,18,18,18,19,19,19,19,20,
%U 20,20,20,21,21,21,22,22,22,22,23,23,23,24,24,24,24,25,25,25,25,26,26,26,27,27
%N Round(3n/2log(n+1)).
%K nonn
%O 2,1
%A _N. J. A. Sloane_, Feb 06 2008, following a suggestion of M. F. Hasler.