On the Ratio of the Sum of Divisors and Euler's Totient Function II
Kevin A. Broughan and Qizhi Zhou
Department of Mathematics
University of Waikato
Private Bag 3105
We find the form of all solutions to φ(n) |
σ(n) with three or fewer prime
factors, except when the quotient is 4 and n is even.
Full version: pdf,
(Concerned with sequences
Received October 31 2013;
revised version received August 4 2014.
Published in Journal of Integer Sequences, August 12 2014.
Journal of Integer Sequences home page