def p7alt(nth=10001):
"""What is the 10001st prime number?"""
N = nth
while nth > N/(math.log(N)-1):
N *= 1.1
N = int(N)
#print('estimated N = %d' % N)
return list(nttools.sieveErat(int(N)))[nth-1]
def p10(N=10):
"""Find the sum of all the primes below two million."""
return sum(nttools.sieveErat(N))
