An even number for which . The first few Positive doubly even numbers are 4, 8, 12, 16, ... (Sloane's A008586).

**References**

Sloane, N. J. A. Sequence A008586 in ``The On-Line Version of the Encyclopedia of Integer Sequences.'' http://www.research.att.com/~njas/sequences/eisonline.html.

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1999-05-24