翻訳と辞書 Words near each other ・ Pyramid Song ・ Pyramid State Recreation Area ・ Pyramid Station ・ Pyramid Technology ・ Pyramid Texts ・ Pyramid triplefin ・ Pyramid Trough ・ Pyramid Valley ・ Pyramid Vritra ・ Pyramid, Illinois ・ Pyramid, Kentucky ・ Pyramid, Nevada ・ Pyramidal alkene ・ Pyramidal cell ・ Pyramidal eminence ・ Pyramidal number ・ Pyramidal peak ・ Pyramidal process of palatine bone ・ Pyramidal tracts ・ Pyramidalis ・ Pyramidalis muscle ・ Pyramidcampa ・ Pyramide ・ Pyramidella ・ Pyramidella achates ・ Pyramidella acus ・ Pyramidella adamsi ・ Pyramidella auricoma ・ Pyramidella ava ・ Pyramidella bairdi Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

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.