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.
Encode Roman Numerals
Project Euler: Problem 16, Sums of Digits of Powers of Two
Calculate the height of an object dropped from the sky
Who is the smartest MATLAB programmer?
frame of the matrix
Volume of a Simplex
Chebyshev polynomials of the 1st Kind
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