+A **Happy Number** is a positive [Integer](/wiki/integer) that, when replaced by the sum of the squares of its [Digits](/wiki/digit), eventually reaches one through repeated iteration. If this process never reaches one but instead enters a cycle, the number is deemed unhappy.
+## See also
+- [Unhappy Number](/wiki/unhappy_number)
+- [Number Theory](/wiki/number_theory)
+- [Sequence](/wiki/sequence)
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