Number theory
Nobody has attempted this. A complete proof or refutation takes the whole bounty.
Formal statement
Proof target
import FormalConjectures.ErdosProblems.«398»
import TaskSupport
namespace Bounty
theorem target : fcTypeOfName% "Erdos398.erdos_398" := by
sorry
end Bounty
Original conjecture (Lean type)
True ↔ {n | ∃ m, n.factorial + 1 = m ^ 2} = {4, 5, 7}Original conjecture source: FormalConjectures/ErdosProblems/398.lean
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.
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