Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I tried a few solutions and they worked fine.
Your solution works fine too on my PC if the given test is the only one.
If there were problems not so many guys would have passed the Python (or the C) kata.
Edit: you should change your function "is_prime".
This comment is hidden because it contains spoiler information about the solution