Jean–Marie De Koninck, Florian Luca
Abstract
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.
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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.
Key concepts: Mathematics, Combinatorics, Function (biology), Euler's formula, Discrete mathematics, Mathematical analysis, Evolutionary biology, Biology