
handle: 11583/2883058
A practical number is a positive integer $n$ such that all positive integers less than $n$ can be written as a sum of distinct divisors of $n$. Leonetti and Sanna proved that, as $x \to +\infty$, the central binomial coefficient $\binom{2n}{n}$ is a practical number for all positive integers $n \leq x$ but at most $O(x^{0.88097})$ exceptions. We improve this result by reducing the number of exceptions to $\exp\!\big(C (\log x)^{4/5} \log \log x\big)$, where $C > 0$ is a constant.
Mathematics - Number Theory, FOS: Mathematics, Number Theory (math.NT), Central binomial coefficient; practical number, Central binomial coefficient, practical number., 11B65 (Primary) 11N25 (Secondary)
Mathematics - Number Theory, FOS: Mathematics, Number Theory (math.NT), Central binomial coefficient; practical number, Central binomial coefficient, practical number., 11B65 (Primary) 11N25 (Secondary)
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