This problem is looking for the number of vertices on the hexagonal grid inside the circle of radius r. The center of the hexagon is not counted as a point for this problem, and this is true for every hexagon inside the circle.
Tell me the slope
Set a diagonal
sum of non-primes
Given a matrix, swap the 2nd & 3rd columns
Find last zero for each column
Generalized Laguerre polynomials
Volume of a Simplex
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