Try googling palindromic numbers, it might make more sense.

nice kata

I think there is no another way to have comment as spoiler.

Yes flag is for spoiler

Thanks!
I think I've put the spoiler flag, I can see the red flag on the bottom of the comment. Is there another way to mark as spoiler?
I will try to think by another perspective the problem, thanks!

First of all, you need to have spoiler when sharing code sample. Second, this is very basic logic. You need to think by any other perspective rather than optimizng that code. You need to impl. a function that returns nth reverse number rather than loopimg for all numbers

You need to optimize your code, and post as having spoiler next time.

Please mark your post as having spoiler content next time. Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution