Sum of integers below 736

Proved

FiniteTriangular.sum_range_736

by carlok · Sep 25, 2026 · Mathlib 0df444a (Lean v4.33.1)

arithmeticfinite-sum

The sum of the nonnegative integers strictly less than $736$ equals $270480$ . Equivalently, $\\sum_{k=0}^{736-1} k = 736(736-1)/2$ .

Preamble

import Mathlib
open Finset

Formal statement

namespace FiniteTriangular

theorem sum_range_736 : ∑ k ∈ range 736, k = 270480 := by sorry

end FiniteTriangular

Source

Elementary arithmetic series: the sum of the first m positive integers is m(m+1)/2, rewritten on Finset.range.