%I A046820
%S A046820 0,2,2,4,2,3,4,3,2,4,3,5,4,2,3,4,2,4,4,6,3,4,5,5,4,6,2,4,3,3,4,
%T A046820 5,2,4,4,6,4,5,6,4,3,5,4,6,5,4,5,6,4,6,6,8,2,3,4,4,3,5,3,5,4,4,
%U A046820 5,6,2,4,4,6,4,5,6,5,4,6,5,7,6,3,4,5,3,5,5,7,4,5,6,6,5,7,4,6,5
%N A046820 Number of 1's in binary expansion of 5n.
%C A046820 a(n) is also the largest integer such that 2^a(n) divides binomial(10n,
               5n) - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 27 2002
%H A046820 Michael Gilleland, <a href="selfsimilar.html">Some Self-Similar Integer 
               Sequences</a>
%F A046820 a(n)=floor(log(gcd(binomial(10*n, 5*n), 2^floor(log(binomial(10*n, 5*n))/
               log(2))))/log(2)) - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 
               27 2002
%Y A046820 Sequence in context: A061338 A135714 A103274 this_sequence A043262 A130860 
               A161535
%Y A046820 Adjacent sequences: A046817 A046818 A046819 this_sequence A046821 A046822 
               A046823
%K A046820 nonn
%O A046820 0,2
%A A046820 N. J. A. Sloane (njas(AT)research.att.com).