Show that (SQRT(2) + 1)^n = SQRT(m) + SQRT(m-1)
Source: IMO Longlist 1989, Problem 31
September 18, 2008
inductionnumber theory unsolvednumber theory
Problem Statement
Let be a positive integer. Show that \left(\sqrt{2} \plus{} 1 \right)^n \equal{} \sqrt{m} \plus{} \sqrt{m\minus{}1} for some positive integer