Centered hexagonal number
- 中心六边形数（中心六边形数是以点表示，可围绕中心一点排成正六边形的有形数）
Centered hexagonal number
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abstract:
A 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.
以上来源于:
WordNet