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%I #5 Mar 30 2012 18:35:25
%S 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,1,2,3,4,5,6,7,8,9,10,11,12,13,
%T 14,15,16,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,3,4,5,6,7,8,9,10,11,
%U 12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,1,2,3,4,5,6,7,8,9,10
%N a(0) = 0; a(n) = a(n/4)/4 if n = a(n/4) = 0 (mod 4); a(n) = a(n-1)+1 otherwise.
%K nonn
%O 0,3
%A _David W. Wilson_
%E Bounded, conjectured maximum is a(1051) = 31.
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