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RS-SMO 2012 Problem 5

    Let K\mathbb{K} be two-dimensional integer lattice. Is there a bijection f:N→Kf:\mathbb{N} \rightarrow \mathbb{K} , such that for every distinct a,b,c∈Na,b,c \in \mathbb{N} we have: gcd⁡(a,b,c)>1⇒f(a),f(b),f(c) are not colinear? \gcd(a,b,c)>1 \Rightarrow f(a),f(b),f(c) \text{ are not colinear? }

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Serbian Mathematical Olympiad 2012 official paper, page 2.

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