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diff --git a/sumofprimes.py b/sumofprimes.py
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+++ b/sumofprimes.py
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+import PIL, math
+import numpy as np
+
+#Problem 10 sum of primes
+###INEFFICIENT###
+#def isPrime(number):
+#	if (number <=1):
+#		return False
+#	for i in range(2,number):
+#		if(number%i==0):
+#			return False
+#	return True
+
+#def prime_factors(number):
+	#primes = []
+	#for i in range(number, 2, -1):
+		#if(number%i==0):
+			#if (isPrime(i)):
+				#return i
+	#return primes
+
+
+
+def prime_factors(number):
+	primes = []
+	if (number <=1):
+		return [1]
+	a = np.ones(number)
+	a[0]=0
+	a[1]=0#not prime
+	for i in range(2,int(math.ceil(math.sqrt(number)))):
+		if(a[i]==1):
+			j = i**2 #cross out all the multiples
+			while(j < number):
+				a[j] = False
+				j+=i
+	
+	for k in range(2, number):
+		#is prime
+		if(a[k]==1):
+			primes.append(k)
+	return primes
+
+out = prime_factors(2000000)
+print str(sum(out))