Erdős problem 1003

Are there infinitely many solutions to $\phi(n) = \phi(n+1)$ , where $\phi$ is the Euler totient function?

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FormalConjectures/ErdosProblems/

1003.lean

Retained formal statement1 of 3

Are there infinitely many solutions to $\phi(n) = \phi(n+1)$ , where $\phi$ is the Euler totient function?

FormalConjectures/ErdosProblems/1003.leanErdos1003.erdos_10031 lineExact file

1True ↔ {n | n.totient = (n + 1).totient}.Infinite

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