Python/project_euler/problem_07/sol1.py

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2018-10-19 12:48:28 +00:00
'''
By listing the first six prime numbers:
2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
What is the Nth prime number?
'''
from __future__ import print_function
from math import sqrt
def isprime(n):
if (n==2):
return True
elif (n%2==0):
return False
else:
sq = int(sqrt(n))+1
for i in range(3,sq,2):
if(n%i==0):
return False
return True
n = int(raw_input())
i=0
j=1
while(i!=n and j<3):
j+=1
if (isprime(j)):
i+=1
while(i!=n):
j+=2
if(isprime(j)):
i+=1
print(j)