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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))
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