lean_workbook_plus_61012

Proved

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

Prove $4^n \equiv 1 \pmod{3}$ for all $n$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_61012 (n:ℕ) : 4 ^ n ≡ 1 [ZMOD 3]   :=  by sorry

Source