The even integers from zero through117

Proved

WorkbookSource.problem_50759

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

lean-workbooksource-checked

the number of even numbers $k\\in \left [ 0,117 \right ]$ is : $\frac{117+1}{2}=59$

Source: InternLM Lean-Workbook, record lean_workbook_50759 (Apache-2.0). The complete source proposition and its explicit variable declarations are preserved.

Preamble

import Mathlib
open Real Nat

Formal statement

theorem WorkbookSource.problem_50759 :
  Finset.card (Finset.filter (λ x => Even x) (Finset.range 117)) = 59  :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_50759; Apache-2.0

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