For k > C sqrt(n log n), the maximum size of a point set in an n by n grid with no k+1 collinear points is exactly k n.
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Settling the no-$(k+1)$-in-line problem when $k$ is not small
For k > C sqrt(n log n), the maximum size of a point set in an n by n grid with no k+1 collinear points is exactly k n.