Vrijeme: 08:34

Crnogorski lanac | Montenegrian chain #3

Koliko ima različitih brojeva n \in \mathbb{N} takvih da vrijedi:

\phi(n)  \mid n^2 + 3

gdje je \phi(n) Eulerova funkcija.

How many different numbers n \in \mathbb{N} are there such that:

\phi(n) \mid n^2 + 3

where \phi(n) is the Euler function.