Broughan, K. A., & Zhou, Q. (2014). On the ratio of the sum of divisors and Euler’s totient function II. Journal of Integer Sequences, 17(9), Article 14.9.2.
Permanent Research Commons link: http://hdl.handle.net/10289/9375
We find the form of all solutions to ø(n) | σ(n) with three or fewer prime factors, except when the quotient is 4 and n is even.
University of Waterloo
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