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diff --git a/10-Summation-of-Primes/sumofprimes.py b/10-Summation-of-Primes/sumofprimes.py
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+++ b/10-Summation-of-Primes/sumofprimes.py
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+import PIL
+import math
+
+# Problem 10 sum of primes
+
+def prime_factors(number):
+    primes = []
+    if (number <= 1):
+        return [1]
+    a = [1] * 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)))