lean_workbook_plus_70031

Proved

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

Prove that $5555^{5555} \equiv 5 \mod9$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_70031 : 5555 ^ 5555 ≡ 5 [ZMOD 9]   :=  by sorry

Source