Conjectures.io

Number theory

Erdős 1003

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

No one has attempted this yet.

Formal statement

Lean type

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

What you must prove

import FormalConjectures.ErdosProblems.«1003»
import TaskSupport

namespace Bounty

theorem target : fcTypeOfName% "Erdos1003.erdos_1003" := by
  sorry

end Bounty

Pinned source: FormalConjectures/ErdosProblems/1003.lean

Source type SHA-256
sha256:5902565df865cd02e0fe1594a872f85f4cd73fa838872192fb91d562fadd53f7
Task id
fc-379fc029-erdos1003-erdos-1003-0b7cccd2cc-formalized-v1
Task commitment
sha256:8c7a6a70a5546c68fd606b9ba59940a5340302ac0f0cebbf268f8e44bb32ca40

Something wrong with this formalization?

A statement that does not faithfully capture the original conjecture is the one real risk here, so we would rather hear about it early - before someone spends weeks on it.