PEN problem K2
Dodao:
Veki9. veljače 2013. Find all surjective functions
![f: \mathbb{N} \rightarrow \mathbb{N}](/media/m/c/3/e/c3e922e496d1f497166720b9e7f9b257.png)
such that for all
![m,n \in \mathbb{N}](/media/m/c/4/2/c428fc23c2ec4092eae3dee25f8bd1bf.png)
%V0
Find all surjective functions $f: \mathbb{N} \rightarrow \mathbb{N}$ such that for all $m,n \in \mathbb{N}$
$m \mid n \Leftrightarrow f(m) \mid f(n)$
Izvor: PEN official problems