Keywords

#happy_number

Happy number

Numbers with a certain property involving recursive summation

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.

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Happy number 70 (number) 800 (number) 900 (number) 700 (number) 7 One Is a Lonely Number Lucky number 13 (number) 500 (number)
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