In a geometric problem (*) appeared the ratio a/b = a(n) = (n - 1) (n^2 - n +1) / (2n^2 - 2n + 1) Questions 1. For which n's (if any) a(n) is an integer? 2. For which n's Sigma a(n) [sum of a(i), i = 1 to n] is integer? (*) https://www.facebook.com/103907057666827/photos/a.103973994326800/503212241069638 APH