翻訳と辞書 Words near each other ・ Tetragrammaton ・ Tetragrammaton (disambiguation) ・ Tetragrammaton in the New Testament ・ Tetragrammaton Labyrinth ・ Tetragrammaton Records ・ Tetragraph ・ Tetragraptus ・ Tetragraptus approximatus ・ Tetrahalomethane ・ Tetrahedral carbonyl addition compound ・ Tetrahedral cupola ・ Tetrahedral honeycomb ・ Tetrahedral hypothesis ・ Tetrahedral kite ・ Tetrahedral molecular geometry ・ Tetrahedral number ・ Tetrahedral prism ・ Tetrahedral symmetry ・ Tetrahedral-cubic honeycomb ・ Tetrahedral-dodecahedral honeycomb ・ Tetrahedral-icosahedral honeycomb ・ Tetrahedral-octahedral honeycomb ・ Tetrahedral-square tiling honeycomb ・ Tetrahedral-triangular tiling honeycomb ・ Tetrahedrally diminished dodecahedron ・ Tetrahedrane ・ Tetrahedrite ・ Tetrahedroid ・ Tetrahedron ・ Tetrahedron (journal) 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 Tetrahedral number ： ウィキペディア英語版 Tetrahedral number A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The ''n''th tetrahedral number is the sum of the first ''n'' triangular numbers. The first ten tetrahedral numbers are: :1, 4, 10, 20, 35, 56, 84, 120, 165, 220, … == Formula == The formula for the ''n''-th tetrahedral number is represented by the 3rd rising factorial of ''n'' divided by the factorial of 3: :$T\_n=\; =$ The tetrahedral numbers can also be represented as binomial coefficients: :$T\_n=.$ Tetrahedral numbers can therefore be found in the fourth position either from left or right in Pascal's triangle. 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「Tetrahedral 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.