OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..200
PROG
(PARI) a(n) = sum(i=1, n, sum(j=1, n, sum(k=1, n, gcd(i, n)/gcd([i, j, k, n]))));
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Seiichi Manyama, May 21 2024
STATUS
approved