olymmath

RO-NMO 2016 Problem 93

  • Grade 9

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) 77 is not spheric. b) a rational spheric number raised to the power of any natural number greater than 11 is spheric.

Dataset text AoPS wiki problems. Quoted with source.

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