lesson_12_ex_1_17_18

def my_primes(x):
    
    counter = 0
    i = 2
    while (i <= x - 1):
        
        if x % i == 0:
            return 'no'
        
        i += 1
    return 'yes'

print my_primes(2), my_primes(1), my_primes(3)

 

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