def unrank(self, n):
"""
Return the n-th prime number.
EXAMPLES::
sage: P = Primes()
sage: P.unrank(0)
2
sage: P.unrank(5)
13
sage: P.unrank(42)
191
"""
return nth_prime(n + 1)
def unrank(self, n):
"""
Return the n-th prime number.
EXAMPLES::
sage: P = Primes()
sage: P.unrank(0)
2
sage: P.unrank(5)
13
sage: P.unrank(42)
191
"""
return nth_prime(n+1)