I know, but that doesn't matter. The question says you will only be given a positive factor, and zero isn't positive. This means that you won't be given zero.

because you can't divide by 0

Ah, I see it, thanks. In the future, if something's "level of spoil" seems equal to or greater than that of my initial comment (which I'm assuming is near the defined threshold), I'll mark it as a spoiler. Also, apologies for the typo in "displayed" (fixed).

Where is the comment displayed besides in the list of solutions

In the homepage's Discourse

Where is the comment displayed besides in the list of solutions, which would all obviously have spoilers? Also, what are the guidelines regarding whether or not something is a spoiler if it's not an outright solution? It can't be "anything somewhat-related to the kata" or else every single comment would be a spoiler on whatever screen (not the solutions list) they show up on.

Please use a spoiler flag.

Never mind, that wouldn't work since they could have two negative numbers

What's the point of checking if factor is zero? The question specifies that factor is positive already

Wouldn't a loop of appending to a string be O(n^2)? So strings.Join would be more efficient, no?

This is kind of stupid but it's still O(n) | O(n) which is optimal

O(n) time, O(n) space