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Catalan's constant

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.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Catalan's constant".