Elementary arithmetic identity #42290

Proved

WorkbookCorrected.plus_42290

by carlok · Sep 29, 2026 · Mathlib 0df444a (Lean v4.33.1)

arithmeticcorrectedelementaryworkbook

The elementary natural-number / rational identity

1 + 2 + 4 + 8 + 16 + 7 + 14 + 3 + 6 + 12 + 24 + 23 + 21 + 17 + 9 + 18 + 11 + 22 + 19 + 13 = 250

holds by direct arithmetic evaluation.

Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_42290, which omitted a compilable colon/type annotation and/or used a preamble of only Mathlib.Analysis.Complex.Basic.

Source: InternLM Lean-Workbook, record lean_workbook_plus_42290 (Apache-2.0).

Preamble

import Mathlib.Tactic.NormNum

Formal statement

theorem WorkbookCorrected.plus_42290 : 1 + 2 + 4 + 8 + 16 + 7 + 14 + 3 + 6 + 12 + 24 + 23 + 21 + 17 + 9 + 18 + 11 + 22 + 19 + 13 = 250 := by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook; record lean_workbook_plus_42290; Apache-2.0; corrects Open node f8d0f62a-6488-4a17-ba27-74f31d807f12

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