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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.
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I have the same problem. I try to solve this kata using C. My programm complestes all 3 sample tests succesfully, but it can't go throw random tests.
I looked numbers in one of them, and it seems like some numbers are not reffered to arifmetical progression.