Duplicate. Changing the language doesn't change the fact there are already a solid bunch of kata about that.
Unpublishing.

Ces tests ne sont pas du tout aléatoires, sacre bleu!

What about it?

Quel bordel!

Если не является простым, то как раз и должно быть False, ещё раз почитайте условие задания

Missing a picture for the n = 3 example!

The worst kata I have ever seen. It is abysmally horrible and annoying to spend 5% of your time on actual algorithm and the rest 95% of the time for rounding the answers in order to pass all the tests

Hey, I'm glad you liked it, and congrats on solving it.

Katas have been getting way harder with time; a 6kyu nowadays is often equivallent to a few of the first 5kyu, even some 4kyu if you look hard enough. 

But the kata is really simple once you understand it, not that that's super easy, but the final solution is simple, thus, most rating it 6kyu.

It's a fabulous kata and I am glad that I did solve it.

But is it really 6 kyu? I've seen lots of extremely easier 6 kyus out there