A037893 - OEIS

%I #6 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 5,4,3,2,1,0,1,6,5,4,3,2,1,0,1,0,1,2,3,4,5,1,0,1,2,3,4,5,1,0,1,2,3,4,

%U 5,1,0,1,2,3,4,5,1,0,1,2,3,4,5,1,0,1,2,3,4,5

%N a(n)=(1/2)*Sum{|d(i)-e(i)|} where Sum{d(i)*7^i} is the base 7 representation of n and e(i) are the digits d(i) in reverse order.

%K nonn,base

%O 1,10

%A _Clark Kimberling_