Fufi je na ploču napisao
nkciju
Odredi
.
Fufi wrote the
nction
on the board. Determine
.
[lang=hr]
Fufi je na ploču napisao $Fu$nkciju
$$f(n) = \sum_{i = 1}^{n} \gcd(i , n)$$
Odredi $f(2025^5)$.
[/lang]
[lang=en]
Fufi wrote the $Fu$nction
$$
f(n) = \sum_{i = 1}^{n} \gcd(i , n)
$$
on the board. Determine $f(2025^5)$.
[/lang]
