def write_primes(val):
    def is_prime(val):
        if val % 2 == 0:
            return val == 2
        for i in range(3, val, 2):
            if val % i == 0:
                return False
        return True

    for i in range(2, val + 1):
        if is_prime(i):
            print(i, end=' ')

write_primes(100)