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"On the Ratio of the Sum of Divisors and Euler's Totient Function II."
Kevin A. Broughan, Qizhi Zhou (2014)
- Kevin A. Broughan, Qizhi Zhou:
On the Ratio of the Sum of Divisors and Euler's Totient Function II. J. Integer Seq. 17(9): 14.9.2 (2014)
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