Small Lattice Ellipses
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Some ellipses that go through exactly 5 to 12 lattice points are shown. The smallest ellipse that passes through exactly 13 lattice points is unknown.
Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Small Lattice Ellipses"
http://demonstrations.wolfram.com/SmallLatticeEllipses/
Wolfram Demonstrations Project
Published: March 7 2011