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antimon2/collatz.py

Created May 5, 2012 10:08
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collatz.py
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collatz.py
def collatz(n):
if n >= 0:
yield n
while n > 1:
n = n / 2 if n % 2 == 0 else n * 3 + 1
yield n
# list(num for num in collatz(3))
# => [3, 10, 5, 16, 8, 4, 2, 1]
# len(list(num for num in collatz(27)))
# => 112
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