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Preferred term

happy number  

Definition

  • In number theory, a happy number is a number which eventually reaches 1 when replaced by the sum of the square of each digit. For instance, 13 is a happy number because , and . On the other hand, 4 is not a happy number because the sequence starting with and eventually reaches , the number that started the sequence, and so the process continues in an infinite cycle without ever reaching 1. A number which is not happy is called sad or unhappy.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Happy_number)

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http://data.loterre.fr/ark:/67375/PSR-SKZ0RG0W-N

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