Sometimes, like with 203, the sequence reaches (and stays at) 1. Numbers like this are called happy. Not all numbers are happy. If we started with 11, the sequence would be: 11 -> 2 -> 4 -> 16 -> ... This sequence will never reach 1, and so the number 11 is called unhappy. Given a positive whole number, you have to determine whether that number is happy or unhappy. Examples happy (203) true happy (11) → false happy (107) → false

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