Write a program that passes value to a function mersenne() and the function return nth mersenne number .

Q. Write a program that passes value to a function mersenne() and the function return nth mersenne number.

Answer = 

def mersenne(x):
    return 2**x-1

num = int(input ("Enter the number :- "))
print (mersenne(num))

Output :-

Enter the number :- 2
3
>>> 

Enter the number :- 6
63
>>>