+A **pentagonal number** is a [Figurate number](/wiki/figurate_number) that counts points arranged in the shape of a regular [Pentagon](/wiki/pentagon). These numbers grow by adding layers of points to form larger pentagonal frames.
+## See also
+- [Triangular Number](/wiki/triangular_number)
+- [Square Number](/wiki/square_number)
+- [Hexagonal Number](/wiki/hexagonal_number)