MathDB
O 42

Source:

May 25, 2007

Problem Statement

Let NnN_{n} denote the number of ordered nn-tuples of positive integers (a1,a2,…,an)(a_{1},a_{2},\ldots,a_{n}) such that 1/a1+1/a2+…+1/an=1.1/a_{1}+1/a_{2}+\ldots+1/a_{n}=1. Determine whether N10N_{10} is even or odd.
Back to ProblemsView on AoPS