def eratosthenes():
    count = 1

    while True:
        count += 1
        mod_of_two = (count % 2 == 0)
        mod_of_three = count % 3 == 0
        mod_of_five = count % 5 == 0
        mod_of_seven = count % 7 == 0

        if (mod_of_two and (count != 2) or (mod_of_three and count != 3) or (mod_of_five and count != 5) or (mod_of_seven and count != 7)):
            pass
        else:
            print(count)
            yield count