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Erdős problem 48

Are there infinitely many integers n,mn, m such that ϕ(n)=σ(m)ϕ(n) = σ(m)?

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Retained declaration

FormalConjectures/ErdosProblems/48.lean

Formal Conjectures

FormalConjectures/ErdosProblems/48.leanErdos48.erdos_481 lineExact file
True ↔ {(n, m) | n.totient = (ArithmeticFunction.sigma 1) m}.Infinite
SolvedStatement only, no proof

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