OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..1000
PROG
(PARI) a(n) = sum(j=1, n, sum(k=1, n, gcd(j, n)*gcd(k, n)/gcd(j*k, n)));
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Seiichi Manyama, May 16 2024
STATUS
approved