1. Hexagonal numberA hexagonal number is a figurate number. The nth hexagonal number will be the number of points in a hexagon with n regularly spaced points on a side. The formula for the nth hexagonal number The first few hexagonal numbers are: 1, 6, 15, 28, 45, 66, 91, 120, 153, 190, 231, 276, 325, 378, 435, 496, 561, 630, 703, 780, 861, 946. Every hexagonal number is a triangular number, but only every other triangular number (the 1st, 3rd, 5th, 7th, etc. ) is a hexagonal number.
Read “Hexagonal number” on English Wikipedia
Read “六角数” on Japanese Wikipedia
Read “Hexagonal number” on DBpedia
Read “Hexagonal number” on English Wikipedia
Read “六角数” on Japanese Wikipedia
Read “Hexagonal number” on DBpedia
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