Odd solutions of $\sigma (n)-2n=2$ have at least six distinct prime factors

2013/82/2 (1) — DOI: 10.5486/PMD.2013.5125 — pp. 255-266

Authors: Yan Li, Lianrong Ma and Junhua Zhang

Abstract:

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Keywords: perfect number, abundant number, deficient number, near-perfect number, primitive abundant number

Mathematics Subject Classification: 11A55, 11A25