Happy number

A **Happy Number** is defined as a number that eventually reaches 1 when replaced repeatedly by the sum of the squares of its digits. If it does not reach 1, it will enter a cycle that does not include 1, and it is then considered an unhappy number. The process for determining if a number is happy can be described as follows: 1. Take the number and replace it with the sum of the squares of its digits. 2. Repeat this process.