diff --git a/003.py b/003.py
new file mode 100644
index 0000000..ee18939
--- /dev/null
+++ b/003.py
@@ -0,0 +1,12 @@
+def factor(n):
+    i = 2
+    while (n % i != 0 and i < n):
+        i = i + 1
+    if i == n:
+        return [n]
+    p = factor(n // i)
+    p.append(i)
+    return sorted(p, reverse=True)
+
+print 'Prime factors of 600851475143:'
+print factor(600851475143)