Triangular, pentagonal, and hexagonal

45.py

@@ -0,0 +1,12 @@
+# Triangular numbers are not needed because they are a subset of hexagonal numbers
+
+def pent(n):
+	return n*(3*n-1)/2
+
+def hex(n):
+	return n*(2*n-1)
+
+pentset = set(pent(x) for x in range(50000))
+hexset = set(hex(x) for x in range(50000))
+
+print pentset & hexset