OFFSET
1,3
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
PROG
(PARI) A009213(n) = gcd(numdiv(n), eulerphi(n)); \\ Antti Karttunen, Sep 07 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved