Erdős problem 1003 · problems.science

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

No current result

No reviewed Result is current in Vela Mathematics Program. Retained source material is shown below.

FormalConjectures/ErdosProblems/1003.lean

Formal Conjectures

FormalConjectures/ErdosProblems/1003.leanErdos1003.erdos_10031 lineExact file

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

OpenStatement only, no proof