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+#!/usr/bin/env python
+
+# Challenge 003
+#
+# Challenge #1
+# Create a script to generate 5-smooth numbers, whose prime divisors are less
+# or equal to 5. They are also called Hamming/Regular/Ugly numbers. For more
+# information, please check this wikipedia.
+
+import sys
+
+# return an iterator to generate the sequence
+# the sequence is a merge of all multiples of 2, 3 and 5
+def hamming_gen():
+    seq = [[1], [1], [1]]
+    base = [2, 3, 5]
+
+    while True:
+        # get the smallest of the multiples
+        n = min(seq[0][0], seq[1][0], seq[2][0])
+
+        for i in range(0, 3):
+            # shift used multiples
+            if seq[i][0] == n:
+                seq[i].pop(0)
+
+            # push next multiple
+            seq[i].append(n*base[i])
+
+        yield n
+
+
+# main
+iter = hamming_gen()
+for i in range(0, int(sys.argv[1])):
+    print(next(iter))