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

Heptagonal number

A heptagonal number is a figurate number that represents a heptagon. The heptagonal number for n is given by the formula n(5n - 3)/2, with n > 0. The first few heptagonal numbers are

1, 7, 18, 34, 55, 81, 112, 148, 189, 235, 286, 342, 403, 469, 540, 616, 697, 783, 874, 970

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