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Project Euler problem 14
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| # refactoring of http://sandrotosi.blogspot.com/2010/03/project-euler-problem-14.html | |
| cache = {1: 1} | |
| def collatz(n): | |
| if n not in cache: | |
| if n % 2 == 0: | |
| cache[n] = 1 + collatz(n/2) | |
| else: | |
| cache[n] = 1 + collatz(3*n + 1) | |
| return cache[n] |
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