The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
Find the sum of all the primes below two million.
import math
def is_prime(n):
if n < 2:return False
for i in range(2,int(math.sqrt(n))+1,1):
if not n % i:return False
return True
print sum( [ i for i in range(10) if is_prime(i) ] )
print sum( [ i for i in range(2000000) if is_prime(i) ] )