OFFSET
1,2
MATHEMATICA
Table[Sum[EulerPhi[n*j*k], {j, 1, n}, {k, 1, n}]/EulerPhi[n], {n, 1, 40}] (* Vaclav Kotesovec, May 10 2024 *)
PROG
(PARI) a(n) = sum(j=1, n, sum(k=1, n, eulerphi(n*j*k)))/eulerphi(n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 09 2024
STATUS
approved