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Ruby
[QUIZ] Happy Numbers (#93)
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[QUOTE="Jacob Fugal, post: 4525789"] Cool, thanks. I had suspected as much, but didn't want to try and prove it. The proof for x >= 1000 (or x >= b ** 3, for arbitrary base) came to me rather intuitively, so that's why I chose that one as a loose upper bound. Jacob Fugal [/QUOTE]
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[QUIZ] Happy Numbers (#93)
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