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2020-IMOC
N1
Integer equation
Integer equation
Source: IMOC 2020
September 4, 2020
IMOC
equation
Integer
number theory
Problem Statement
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<span class='latex-bold'>N1.</span>
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Find all nonnegative integers
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such that \begin{align*} a^2+b^2+c^2-ab-bc-ca = a+b+c \end{align*} Proposed by usjl
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