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+#!/usr/bin/env python3
+#
+#
+#       chowla.py
+#
+#       TASK #1 › Chowla Numbers
+#         Submitted by: Mohammad S Anwar
+#         Write a script to generate first 20 Chowla Numbers, named after, Sarvadaman D. S. Chowla, a London born Indian American mathematician. It is defined as:
+# 
+#         C(n) = sum of divisors of n except 1 and n
+#
+#         Output:
+#         0, 0, 0, 2, 0, 5, 0, 6, 3, 7, 0, 15, 0, 9, 8, 14, 0, 20, 0, 21
+#
+#
+#
+#       © 2021 colin crain
+## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
+
+import math
+
+def sum_divisors (n):
+    out = 0
+    for d in range( 2, int(math.sqrt(n))+1 ):
+        id = divmod(n,d)
+        if id[1] == 0:
+            out += d 
+            if id[0] != d:
+                out += id[0]
+    return out
+
+
+for n in range(1,21):
+    print(f"C({n}) = ", sum_divisors(n))
+
+