The Octagonal number reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Octagonal number

An octagonal number is a figurate number that represents an octagon. The octagonal number for n is given by the formula n(3n - 2), with n > 0. The first few octagonal numbers are

1, 8, 21, 40, 65, 96, 133, 176, 225, 280, 341, 408, 481, 560, 645, 736, 833,936

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