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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.
I did exactly that, O(1) for one prime and using inclusion-exclusion means that I have to do that binom(n, k) times for 1 <= k <= n.
I pass 6 out of 6 30 digits tests but then my code times out. Am I still missing something?