resolved, i guess?

That depends on the values tested.

I get Timeout Error but when i test my code,it will be passed.

somebody approved it

Nice to be forced to come up with an alternate way of solving this type of problem.

Thank you for your answer, I'm using Ruby. I can see where I got a bit confused now.

The point is 8kyu is beginner level. Beginners should focus on functional code, and then worry about optimization. Optimization is beyond 8kyu.

Actually, only 15 and 15023 are tested in the sample tests and both are odd.

But to pass the kata, you have to pass the complete tests, and these will contain both odd and even numbers.

What language is that ? There is no reason to check only for odd inputs.

No, why?

Shouldn't the description state that all inputs / tests will be odd numbers?

Approved by someone

Using one's brain makes sense at any rank.