Catalan

Name

Catalan — Catalan's constant

Syntax

Catalan

Value

0.915965594177219 ...

Description

Catalan's constant is the sum
Catalan = Sum( ( -1 ) ^ n / ( 2 * n + 1 ) ^ 2 , n = 0 ... Infinity )

It is unknown whether the Catalan's constant is irrational.