In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as alphas (units). These are one type of 2-dimensional figurate numbers.
Read more about Polygonal Number: Definition and Examples, Formula, Table of Values, Combinations
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“That country is the richest which nourishes the greatest number of noble and happy human beings.”
—John Ruskin (1819–1900)