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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
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 23 13:59 EDT 2021. Contains 345402 sequences. (Running on oeis4.)