After 32 years of waiting, mathematicians calculate Dedekind's ninth number, a 42-digit giant that defied logic.

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Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Khadija Khartit is a strategy, investment, and funding expert, and an educator of fintech ...

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The ninth Dedekind number, then – still undiscovered by 2023, some 32 years after its predecessor was found – was overdue.