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Positive Integers n Such That σ(φ(n)) = σ(n)

By Jean-marie De Koninck, Florian Luca and Morelia Michoacán


In this paper, we investigate those positive integers n for which the equality σ(φ(n)) = σ(n) holds, where σ is the sum of the divisors function and φ is the Euler function

Year: 2008
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