1. Polygonal numberIn mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots were thought of as alphas (units). These are one type of 2-dimensional figurate numbers.
Read “Polygonal number” on English Wikipedia
Read “多角数” on Japanese Wikipedia
Read “Polygonal number” on DBpedia
Read “Polygonal number” on English Wikipedia
Read “多角数” on Japanese Wikipedia
Read “Polygonal number” on DBpedia
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