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Heptagonal Pyramidal Number

A pyramidal number of the form n(n+1)(5n-2)/6, The first few are 1, 8, 26, 60, 115, ... (OEIS A002413). The generating function for the heptagonal pyramidal numbers is

(x(4x+1))/((x-1)^4)=x+8x^2+26x^3+60x^4+....

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References

Sloane, N. J. A. Sequence A002413/M4498 in "The On-Line Encyclopedia of Integer Sequences."

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Heptagonal Pyramidal Number

Cite this as:

Weisstein, Eric W. "Heptagonal Pyramidal Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HeptagonalPyramidalNumber.html

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