中心つき六角数
1. Centered hexagonal numberA centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice. The nth centered hexagonal number is given by the formula Expressing the formula as shows that the centered hexagonal number for n is 1 more than 6 times the (n−1)th triangular number.
Read “Centered hexagonal number” on English Wikipedia
Read “中心つき六角数” on Japanese Wikipedia
Read “Centered hexagonal number” on DBpedia
Read “Centered hexagonal number” on English Wikipedia
Read “中心つき六角数” on Japanese Wikipedia
Read “Centered hexagonal number” on DBpedia
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