MathDB
Integer equation

Source: IMOC 2020

September 4, 2020
IMOCequationIntegernumber theory

Problem Statement

<spanclass=latexbold>N1.</span><span class='latex-bold'>N1.</span> Find all nonnegative integers a,b,ca,b,c such that \begin{align*} a^2+b^2+c^2-ab-bc-ca = a+b+c \end{align*} Proposed by usjl