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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.
100% correct!! This comment is sooo close to being a spoiler, but I can't complain, as it probably saved me hours.
What is the purpose of the variable "gap"?
You can find a better range than this: for i in range(2, n+1)
Google is your friend. Try "prime factors algorithm"