Elementary arithmetic identity #53900

Proved

WorkbookCorrected.plus_53900

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

arithmeticcorrectedelementaryworkbook

The elementary natural-number / rational identity

122 + 145 + 170 + 197 + 226 + 257 + 290 + 325 + 362 + 401 = 2495

holds by direct arithmetic evaluation.

Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_53900, 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_53900 (Apache-2.0).

Preamble

import Mathlib.Tactic.NormNum

Formal statement

theorem WorkbookCorrected.plus_53900 : 122 + 145 + 170 + 197 + 226 + 257 + 290 + 325 + 362 + 401 = 2495 := by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook; record lean_workbook_plus_53900; Apache-2.0; corrects Open node 8f3cf6ec-50bd-4c81-9b6e-5168bc9448db

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