On the ratio of the sum of divisors and Euler’s totient function II

Broughan, Kevin A.Zhou, Qizhi2015-06-0920142015-06-092014Broughan, 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.https://hdl.handle.net/10289/9375We 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.application/pdfen© 2014 copyright with the authors.Euler’s totient functionSum of divisorsOn the ratio of the sum of divisors and Euler’s totient function IIJournal Article1530-7638