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aoeuidht/gist:4528572

Created January 14, 2013 08:12
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gistfile1.py
def sigma(n):
return n and (n + sigma(n-1)) or 0
def sigma_tail(n, sum=0):
return n and sigma_tail((n-1), (n+sum)) or sum
print sigma(50)
print sigma_tail(50)
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