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

Pentagonal pyramidal number

A pentagonal pyramidal number is a number equal to the sum of the first few pentagonal numbers. The first few are 1, 6, 18, 40, 75, 126, 196, 288, 405, 550, 726, 936, 1183, 1470, 1800, 2176, 2601, 3078, 3610, 4200, 4851, 5566, 6348, 7200, 8125, and 9126.

See also:

• Triangular pyramidal number
• Square pyramidal number

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