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.

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, 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, 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

Offset

1,3

Links

Paul Tek, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A161399.

Sequence in context: A217663 A078701 A299766 * A204455 A318653 A161820

Adjacent sequences: A161395 A161396 A161397 * A161399 A161400 A161401

Keyword

base,nonn

Author

Leroy Quet, Jun 09 2009

Extensions

More terms from Sean A. Irvine, Oct 22 2009

Status

approved