Python | sympy.prevprime() method

In sympy module, we can get the previous prime number for a given number n using sympy.prevprime() function. For n < 2^64 the answer is definitive; larger n values have a small probability of actually being pseudoprimes. 
 

Syntax:  sympy.prevprime()
Parameter:  n; number to be tested
Return:  previous prime value

Code #1: 

Output: 
 

5
11

Code #2: 

Output: 
 

ValueError: no preceding primes