Prove2Me

The units digit of a large power

Proved
WorkbookSource.problem_12643

by wamlart · Sep 12, 2026 · Mathlib 0df444a (Lean v4.33.1)

lean-workbooksource-checked

Find the units digit in the number 23200723^{2007}

Source: InternLM Lean-Workbook, record lean_workbook_12643 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble
import Mathlib
open Real Nat
Formal statement
theorem WorkbookSource.problem_12643 : 23 ^ 2007 ≡ 7 [MOD 10]  :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_12643; Apache-2.0

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