There's nothing in the example tests. Right now it only has the default sample test cases given by Codewars for Ruby.

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Reached 4000 honor with this kata! Very fun to solve IMO.

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Glad to hear! It's a very niche but enjoyable area in mathematics!

Approved.

Very fun to solve! Enjoyed it a lot!

Ughhh, I'm so stupid.

I had everything correct. All I needed to do was one small thing (that I 100% knew how to do) and it would have been fine. And I gave up right before figuring out the answer.

Very embarrasing since I managed to solve the 1-kyu Javascript version without too much trouble, although now that I understand what I needed to do, I do think that overall the kata was pretty good!

Wow, that is seriously impressive, you actually managed to shove it all in a lambda expression. Good job!

You're right, I should add a bit about that.

This is my first 1-kyu, it was pretty enjoyable to solve!

I'm currently at 3-kyu overall, and had decided to go for a 1-kyu as I have been recently only been solving kata in the range of 8-kyu to 5-kyu, and had wanted to challenge myself by solving either a 1-kyu or my third 2-kyu.

However, I personally think that this is more of a 2-kyu because aside from the algorithm implementation, I wouldn't say that the character limit is that much of an issue. In fact to me the character limit could be 3000-3500 chars and the kata's difficulty would probably still be about the same.

@user9644768 Why wouldn't sum be allowed? It's a similar method to what is done for C/C++.

Forked and merged fix.