Created
December 27, 2009 10:49
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| def collatz(arg): | |
| if type(arg) == int: | |
| arg = [arg] | |
| elif arg[-1] == 1: | |
| # print arg => [10, 5, 16, 8, 4, 2, 1] | |
| return arg | |
| if arg[-1] % 2 == 0: | |
| arg.append(arg[-1] / 2) | |
| collatz(arg) | |
| else: | |
| arg.append(arg[-1] * 3 + 1) | |
| collatz(arg) | |
| print collatz(10) # => None |
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