olymmath

OSN 2014 Problem 8

  • Day 2

A positive integer is called beautiful if it can be represented in the form x2+y2x+y\dfrac{x^2+y^2}{x+y} for two distinct positive integers x,yx,y . A positive integer that is not beautiful is ugly.

a) Prove that 20142014 is a product of a beautiful number and an ugly number. b) Prove that the product of two ugly numbers is also ugly.

Dataset text AI-MO AoPS. Quoted with source.

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