Finite connected components of the aliquot graph
Abstract
Conditional on a strong form of the Goldbach conjecture, we determine all finite connected components of the aliquot graph containing a number less than 109, as well as those containing an amicable pair below 1014 or one of the known perfect or sociable cycles below 1017. Along the way we develop a fast algorithm for computing the inverse image of an even number under the sum-of-proper-divisors function.
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