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It is somewhat complicated; so I want to point out to the Wikipedia article that explains it: http://en.wikipedia.org/wiki/Happy_number
The origin of the name "happy" is not explained there, it seems; I would guess it means "happy" in the sense of "lucky", in the sense that you are lucky to get a certain result.
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Earn +20 ptsQ: How do you explain happy numbers and why they are happy?
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