lean_workbook_plus_61272

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

What is the sum of: $1^{3}+ 2^{3}+ 3^{3} + ....+ 20^{3}?$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_61272 : ∑ k in Finset.range 21, k^3 = 44100   :=  by sorry

Source