%I #4 Mar 30 2012 18:56:19
%S 1,2,3,4,5,6,20,8,1,12,14,16,18,34,11,24,2,28,30,32,48,13,27,40,3,44,
%T 46,62,15,29,43,56,4,60,76,17,31,45,59,72,5,6,19,33,47,61,75,88,237,
%U 94,20,153,174,195,216,93,8,9,119,122,125,128,96
%N a(n)=least k such that base 7 representation of n begins at s(k), where s=A031007.
%K nonn
%O 1,2
%A _Clark Kimberling_