for num in range(1,50): for i in range(2,num): if num%i == 0: break else: print(num,'is a prime')
Standard input is empty
1 is a prime 2 is a prime 3 is a prime 5 is a prime 7 is a prime 11 is a prime 13 is a prime 17 is a prime 19 is a prime 23 is a prime 29 is a prime 31 is a prime 37 is a prime 41 is a prime 43 is a prime 47 is a prime