Happy Number

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A Happy Number is one where the repeated process of squaring and adding the digits eventually gives an answer of 1.

For example: 13

If a sequence like this reaches 1 it will stay there. 13 is a Happy Number!

However some numbers do not reach one. For example: 14

which we've seen before...

14 is an Unhappy Number.

This procedure is an example of a Number Chain

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