ComputerCraft primes

function prime(n)
    for i = 2, n^(1/2) do
        if (n % i) == 0 then
            return false
        end
    end
    return true
end
-- This script calculates prime numbers.
local num = 0
while true do
     num = num + 1
     if prime(num) then
        print(num)
     end
     sleep(0.05)
end