Happy numbers
A happy number is 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 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.
Test
{{test}}Console output