Well, it's a puzzle. You're supposed to figure out the rule yourself.

If you don't see all 100 random tests finished running, that means you haven't finished all the tests and it got terminated mid-test :)

And please don't complain about tests seem off, 23 people have already solved the kata so it's obviously completeable :P

I agree your tests seem off, passed all test but still threw a timeout error.

Log:

Time: 340ms Passed: 105 Failed: 0
Test Results:
 Basic Tests
 It should works for basic tests. (5 of 5 Assertions)
Completed in 6ms
 100 Random Tests --- Testing for correctness of solution
 It should works for random tests. (100 of 100 Assertions)
Completed in 31ms

No, It's not an issue of my kata. Please improve your code to pass the kata ;-)