3.20. First Non-Prime

Write a function named find_first_non_prime to find the first non-prime number in the given list. If all the numbers are prime, return False.

Hint: You can define a helper function to determine whether a number is prime or not then use it in your function.

Sample I/O:

>>> find_first_non_prime([2,3,4,7])
4

>>> find_first_non_prime([2,3,5,7])
False

>>> find_first_non_prime([2,3,51,19])
51

Show the Answer

def is_prime(number):   # helper function
    for i in range(2, number):
        if number % i == 0:
            return False

    return True

def find_first_non_prime(items):
    for item in items:
        if not is_prime(item):
            return item

    return False