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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.
This kata will test some very large numbers and time out. I won't spoil the answer, but you don't have to test all the numbers from 2 to n.
Array.prototype.push() returns the new length of the array not the array itself. This got me at first too.