Prirodni broj
![n](/media/m/a/e/5/ae594d7d1e46f4b979494cf8a815232b.png)
je zanimljiv ako je
![\varphi(n)](/media/m/9/6/5/9658f979a8934c0630b5792d63840396.png)
neparan. Odredi sumu svih zanimljivih brojeva.
Positive integer
![n](/media/m/a/e/5/ae594d7d1e46f4b979494cf8a815232b.png)
is interesting if
![\varphi(n)](/media/m/9/6/5/9658f979a8934c0630b5792d63840396.png)
is odd. Calculate the sum of all interesting numbers.
[lang=hr]
Prirodni broj $n$ je zanimljiv ako je $\varphi(n)$ neparan. Odredi sumu svih zanimljivih brojeva.
[/lang]
[lang=en]
Positive integer $n$ is interesting if $\varphi(n)$ is odd. Calculate the sum of all interesting numbers.
[/lang]