Erdős problem 48 · problems.science

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

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1 retained statement2415f78e850a

FormalConjectures/ErdosProblems/

48.lean

Retained formal statement1 of 1

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

FormalConjectures/ErdosProblems/48.leanErdos48.erdos_481 lineExact file

1True ↔ {(n, m) | n.totient = (ArithmeticFunction.sigma 1) m}.Infinite

SolvedStatement only, no proof