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Line 2: [[Category:Number theory]] {{CatAutoTOC}} ~~Existence of Odd Perfect Numbers~~ A perfect number is a positive integer that is equal to the sum of its proper divisors. All known perfect numbers are even, and it is unknown whether any odd perfect numbers exist. This remains one of the oldest unsolved problems in number theory. ~~<ref>"The Oldest Unsolved Problem in Math." Veritasium, https://www.youtube.com/watch?v=Zrv1EDIqHkY.</ref>~~

Category:Unsolved problems in number theory: Difference between revisions