Are you getting some sort of error or just time out?

So i tried these numbers on my local pc and everything works fine, also for 933555431. Still I don't know the issue. Could it be lack of memory or sth like that? What is more iteresting, my code also crashes or returns a bad value with 7919 on input, where it's a very easy case and also looks fine on my local machine.

It is a question, not an issue of the kata but a problem of your code. You could read https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution.

i tried to make it faster as much as i could but its still taking over 12 secs
created a list of primes and every new num checked on the list rather than range, checking only odd numbers
what can i do?
(python)

Ooh, I didn't think about it. Thank you for help, I will check this out, also for cases from codewars.

Do you also get a crash when running your solution in your IDE locally? Did you know what input crashes your solution? You can read this for some hints.

I did run your solution in my VS and it crashes at line 35: primes[j] = false; for some numbers, for example 933555431