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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク pyramidal number ： ウィキペディア英語版 pyramidal number A pyramidal number is a figurate number that represents a pyramid with a polygonal base and a given number of triangular sides. The term usually refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to: *Triangular pyramidal number (three sides) *Square pyramidal number (four sides) *Pentagonal pyramidal number (five sides) *Hexagonal pyramidal number (six sides) *Heptagonal pyramidal number (seven sides) as well as to pyramids with higher numbers of sides 〔http://oeis.org/A002414〕 The formula for an ''r''-gonal pyramidal number is: :$P\_n^r=\; \backslash frac,$ with r ∈ ℕ, r ≥ 3. This formula can be factorized as follows: :$\backslash beginP\_n^r=\backslash frac=\backslash left()\backslash left()=T\_n\backslash \; \backslash left()\backslash end.$ == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pyramidal number」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.