Main Page | See live article | Alphabetical index Catalan's constant K, which occasionally appears in estimates in combinatorics, is defined by or equivalently Its numerical value is approximately K = .915 965 594 177 219 015 054 603 514 932 384 110 774 ... It is not known whether K is rational or irrational. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.