simply because the sympy module is not available

from sympy import isprime as num
But Codewars doesn't accept import sympy as a valid solution :(

lol wow

Fixed in latest fork

Fixed.

it can be seen in the home page (for people who don't know)

I think OP meant "" is neither tested nor mentioned anywhere in the description

fixed

I agree... The 'Simple' time bomb is a higher kyu level than the 'Hard' one?..

Isn't it considered bad practice to modify states outside using setState()?

Brilliant solution

Reraised above with more detail

The solution itself is simple, the hard part is analyzing and finding the solution; look around, many people think like me, even in the solutions u can see ppl writing how hard it actually was. I solved easier 5kyu katas.