lean_workbook_plus_65698

Proved

by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

Find an example of a pair $(6n-1, 6n+1)$ where neither number is prime.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_65698 : ∃ n, ¬ Nat.Prime (6 * n - 1) ∧ ¬ Nat.Prime (6 * n + 1)   :=  by sorry

Source