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A161398 a(n) = the smallest divisor of n that contains the same number of 1's as n when both numbers are written in binary. 2

%I

%S 1,1,3,1,5,3,7,1,3,5,11,3,13,7,15,1,17,3,19,5,7,11,23,3,25,13,27,7,29,

%T 15,31,1,3,17,7,3,37,19,39,5,41,7,43,11,15,23,47,3,7,25,51,13,53,27,

%U 55,7,57,29,59,15,61,31,63,1,5,3,67,17,69,7,71,3,73,37,15,19,77,39,79,5,81

%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.

%K base,nonn

%O 1,3

%A _Leroy Quet_, Jun 09 2009

%E More terms from _Sean A. Irvine_, Oct 22 2009

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Last modified July 30 17:21 EDT 2021. Contains 346359 sequences. (Running on oeis4.)