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.
Now that's good
It's probably because you are making an array of all numbers from 1 to n.
The solution is much simpler. And it takes one line too.
I can get it in one line but it throws a MemoryError :/