Benson's Formula
An equation for a Lattice Sum with 
Here, the prime denotes that summation over (0, 0, 0) is excluded. The sum is numerically equal to
, avalue known as ``the'' Madelung Constant.See also Madelung Constants
References
Borwein, J. M. and Borwein, P. B. Pi & the AGM: A Study in Analytic Number Theory and Computational Complexity. New York: Wiley, p. 301, 1987. Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/mdlung/mdlung.html
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