From OeisWiki
Intended for: January 3, 2012
Timetable
 First draft entered by Alonso del Arte on October 30, 2011 ✓
 Draft reviewed by Daniel Forgues on November 6, 2011 ✓
 Draft to be approved by December 3, 2011
The line below marks the end of the <noinclude> ... </noinclude> section.
A000265: Largest
odd divisor of
.

{ 1, 1, 3, 1, 5, 3, 7, 1, ... } 
Obviously
only when
is a power of
and
only when
is an odd
noncomposite number. Somewhat less obviously, this is the numerator of
and the denominator of
.