Connectedness conjecture for the lattice of superabundant numbers
Let be the set of superabundant numbers, meaning the integers for which
where denotes the sum of the divisors of . Consider the lattice whose vertices are the elements of and whose links correspond to multiplication or division by primes.
Connectedness conjecture. Given a superabundant number , either there is a prime such that is superabundant or there is a prime such that is superabundant; moreover, there is always a chain of primes such that successive multiplication or division by these primes reaches .
This is proposed as a weaker version of the Alaoglu–Erdős conjecture after computational counterexamples to both its upward and downward halves. The source does not report a resolution of this weaker conjecture.
References
Primary source
Tibor Burdette and Ian Stewart, “Counterexamples to a Conjecture by Alaoglu and Erdős”, arXiv:2009.03306 (2020).
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