Universal odd-prime valuation bound for the sum of divisors
Universal odd-prime valuation bound for the sum of divisors
Let be a fixed prime, and let . Write for the sum of the positive divisors of , and let denote the -adic valuation. For a prime , write for the exponent of in . The relevant conditions are: (1) every prime dividing satisfies ; or (2) every prime dividing that satisfies is less than .
Universal odd-prime valuation conjecture. Every satisfies condition (1) or (2). Consequently,
A complete characterization of the indices for which equality holds in this bound remains open, although the bound is proved under the stated conditions.
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Primary source
Tewodros Amdeberhan, Victor H. Moll, Vaishavi Sharma and Diego Villamizar, “Arithmetic properties of the sum of divisors”, arXiv:2007.03088 (2020).
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