3

This number is a prime.

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Paul Erdős observed that, when n is a prime number in the no-three-in-line problem, the set of n grid points (i, i^2 mod n), for 0 ≤ i < n, contains no 3 collinear points.

Submitted: 2020-07-31 10:07:40;   Last Modified: 2020-07-31 10:11:45.
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