happy number
From Wiktionary, the free dictionary
English
Noun
happy number (plural happy numbers)
- (mathematics) Any number that eventually reaches 1 after some number of iterations of replacing each of its digits by the sum of that digit's squares.
- Antonyms: sad number, unhappy number
- 13 is a happy number because 1² + 3² is 10, and 1² + 0² is 1.
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