lean_workbook_plus_10976

Proved

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

Prove that $19^{128} \equiv -1 \mod 257$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_10976 : 19 ^ 128 ≡ -1 [ZMOD 257]   :=  by sorry

Source