Please do not publish kata which are not ready to be published.

• Sample tests are missing.
• There is no random tests.
• Please avoid mixed output types and "side problems" like input validation. It does not make the task more interesting, and makes the kata difficult to translate.
• I think the task is similar to some other "arithmetic sequence" kata, but I'd have to find one.

EDIT:

• This one is very similar: https://www.codewars.com/kata/586f6741c66d18c22800010a, but not the same