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there is no rule (lemmy.world)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] [email protected] 15 points 5 months ago

In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.

https://en.wikipedia.org/wiki/Perfect_number