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If the numbers go in a loop, keep going on forever, than it is a happy number but if it stops at a 1 like 1 , 10, 100, 1000 so on than it is a sad number E.G

39 - 90 - 81 - 65 - 61 - 37 - 58 - 89 - 145 - 42 - 20 - 4 - 16 - 37 - 58 this is a happy number because it would keep going in a loop as you can see there is 58 twice.

explanation from James Norman Coventry!

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13y ago

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