
For any positive integer n, there exists a circle that passes through exactly n lattice points in the Euclidean plane.
This was first proven by Polish mathematician Andrzej Schinzel in 1958. It’s known as Schinzel’s theorem.

For any positive integer n, there exists a circle that passes through exactly n lattice points in the Euclidean plane.
This was first proven by Polish mathematician Andrzej Schinzel in 1958. It’s known as Schinzel’s theorem.
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