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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 would, no offense. The description of the problem leaves much to be desired anyways. What's next should we call the fibonacci series as "a collection of numbers where a number is the sum of the previous two" so that its harder for people to research if they don't know about its existence. I can hardly understand how the function should be written without looking at the tests and rereading the description 3 times. There are ways to write a description which makes things interesting without holding the person's hand.
Edit: To clarify I really don't mind googling as much as some here in the comments, that's how I have learned anything especially regarding programming or pen testing, but give better hints. Otherwise it was quite a fun kata.
Examples describe better than words before them.
I wouldn't call myself lazy. I purposefully left out the formula for someone to figure that out themselves... The problem came in when a moderator down-rated it to 8 kyu without changing anything in the description.