OFFSET
1,6
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
FORMULA
PROG
(PARI) A318326(n) = sumdiv(n, d, (-1==moebius(n/d))*(sigma(d)-d));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 26 2018
STATUS
approved