A figurate number in which layers of polygons are drawn centered about a point instead of with the point at a polygon vertex.
Centered Polygonal Number
See also
Centered Pentagonal Number, Centered Square Number, Centered Triangular Number, Hex NumberExplore with Wolfram|Alpha
References
Sloane, N. J. A. and Plouffe, S. Figure M3826 in The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.Referenced on Wolfram|Alpha
Centered Polygonal NumberCite this as:
Weisstein, Eric W. "Centered Polygonal Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CenteredPolygonalNumber.html