%N a(n) = the smallest divisor of n that contains the same number of 1's as n when both numbers are written in binary.
%H Paul Tek, <a href="/A161398/b161398.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A161399.
%A _Leroy Quet_, Jun 09 2009
%E More terms from _Sean A. Irvine_, Oct 22 2009