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%I #5 Mar 30 2012 18:56:32
%S 0,0,0,0,0,0,1,0,1,2,3,4,5,2,1,0,1,2,3,4,3,2,1,0,1,2,3,4,3,2,1,0,1,2,
%T 5,4,3,2,1,0,1,6,5,4,3,2,1,0,1,1,2,3,4,5,6,1,0,1,2,3,4,5,2,1,1,2,3,4,
%U 5,3,2,2,2,3,4,5,4,3,3,3,3,4,5,5,4,4,4,4,4,5
%N a(n)=(greatest base 7 digit of n)-(least base 7 digit of n).
%K nonn,base
%O 1,10
%A _Clark Kimberling_