happy number
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numbers with a certain property involving recursive summation
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Encyclopedic overview
Tree showing all happy numbers up to 100, and 130 Sad numbers up to 100 showing the repeating cycle of 8 numbers In number theory, a happy number is a number which eventually reaches 1 when the number is replaced by the sum of the square of each digit. For instance, 13 is a happy number because
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Excerpted from Wikipedia’s “happy number” article, available under the CC BY-SA 4.0 licence.