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  1. en.wikipedia.org › wiki › Happy_numberHappy number - Wikipedia

    A number which is not happy is called sad or unhappy. More generally, a b {\displaystyle b} - happy number is a natural number in a given number base b {\displaystyle b} that eventually reaches 1 when iterated over the perfect digital invariant function for p = 2 {\displaystyle p=2} .

  2. en.wikipedia.org › wiki › Spoon_theorySpoon theory - Wikipedia

    Spoon theory is a metaphor that is used to describe the amount of mental or physical energy a person has available for daily activities and tasks. It was developed by Christine Miserandino as a way to express how it felt to have lupus.