Heptagonal pyramidal number

From Wikipedia, the free encyclopedia

You have new messages (last change).

A heptagonal pyramidal number is the sum of the first few heptagonal numbers. The heptagonal number for n can be calculated by adding up the heptagonal numbers for 1 to n, or by using the formula n(n + 1)(5n - 2)/6.

The first few heptagonal pyramidal numbers are:

1, 8, 26, 60, 115, 196, 308, 456, 645, 880, 1166, 1508, 1911, 2380, 2920, 3536, 4233, 5016, 5890, 6860, 7931, 9108

Image:Integer.gif  This number article is a stub. You can help by expanding it.
Retrieved from "http://en.wikipedia.org../../../h/e/p/Heptagonal_pyramidal_number.html"
In other languages