A property of spheres defined on rational grids
Source: Romania National Olympiad 2016, grade ix, p. 3
August 25, 2019
number theorygeometry3D geometrysphere
Problem Statement
We say that a rational number is spheric if it is the sum of three squares of rational numbers (not necessarily distinct). Prove that:a) is not spheric.
b) a rational spheric number raised to the power of any natural number greater than is spheric.