Happy number

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number either 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, while those that do not end in 1 are unhappy numbers (or sad numbers).

Overview

More formally, given a number , define a sequence , , ... where is the sum of the squares of the digits of . Then n is happy if and only if there exists i such that .

If a number is happy, then all members of its sequence are happy; if a number is unhappy, all members of the sequence are unhappy.

For example, 19 is happy, as the associated sequence is:

The 143 happy numbers up to 1,000 are:

The happiness of a number is unaffected by rearranging the digits, and by inserting or removing any number of zeros anywhere in the number.

The distinct combinations of digits that form happy numbers below 1,000 follow (the rest are just rearrangements and/or insertions of zero digits):