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What is a happy number?

What is a happy number?

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A few days ago
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A happy number is defined by the following process. Starting with any positive integer, the following process can be applied: replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers and those that do not are unhappy numbers

http://en.wikipedia.org/wiki/Happy_number

The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, …

http://mathworld.wolfram.com/HappyNumber.html

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