def get_prime_sum(limit):
# Start with the first prime.
prime_sum = 2
for x in xrange(3, limit + 1, 2):
if is_prime_eff(x):
prime_sum += x
return prime_sum
def get_nth_prime(n):
# Cutting corners, problem gives 6 primes, starting at there.
prime_count = 6
current_prime = 13
for x in count(current_prime + 2):
if eu.is_prime_eff(x):
current_prime = x
prime_count += 1
if prime_count == n:
break
return current_prime