lean_workbook_plus_18120

Proved

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

Prove $\forall n \in N$ \n\n $\left. 7 \right|3^{2n + 1} + 2^{n + 2}$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_18120 (n : ℕ) : 7 ∣ 3^(2 * n + 1) + 2^(n + 2)   :=  by sorry

Source