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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.
On first glance I figured "a number n" wasn't a specific n (as in "a number, n" or "the number n") but any of the given numbers. You'd ensure they all individually resolve with their respective "other" numbers.
It's definitely not something someone should get stuck on, but it confused at least one other person for a moment as well.
It is not very clear that the first given number is the test case. I at first assumed every n had to validate with every other n.
It took me a glance at the examples to understand what was being asked.