Sum of the nonnegative integers below 1032
ProvedFiniteTriangular.sum_range_1032algebrafinset
The sum of the integers from through equals , which is the triangular number .
Preamble
import Mathlib open Finset
Formal statement
namespace FiniteTriangular theorem sum_range_1032 : ∑ k ∈ range 1032, k = 531996 := by sorry end FiniteTriangular
Source
The closed form for the sum of an initial segment of the nonnegative integers.