2017-07-02から1日間の記事一覧
問題 Problem 45:Triangular, pentagonal, and hexagonal Triangle, pentagonal, and hexagonal numbers are generated by the following formulae:Triangle:Tn=n(n+1)/2 1, 3, 6, 10, 15, ... Pentagonal:Pn=n(3n−1)/2 1, 5, 12, 22, 35, ... Hexagonal…