On the Equation σ(n) = n + φ(n)
Douglas E. Iannucci
Towers Condominiums B-16
St. Thomas, VI 00802
In this paper we consider the equation σ(n) = n +
φ(n), for which n = 2 is the only known solution. We provide
necessary conditions for the existence of any larger solutions.
Full version: pdf,
(Concerned with sequences
Received January 9 2017; revised version received May 22 2017.
Published in Journal of Integer Sequences, June 25 2017.
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