: Matemáticas: centered polygonal numbers

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centered polygonal numbers

The centered polygonal numbers are a class of series of figurate numbers, each formed by a central dot, surrounded by polygonal layers of dots with a constant number of sides. Each side of a polygonal layer contains one more dot than each side in the previous layer; so starting from the second polygonal layer, each layer of a centered k-gonal number contains k more dots than the previous layer.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Centered_polygonal_number)

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