Find the number of points (x,y) in square lattice with x^2 + y^2 =< n. This is related to Jame's Problem 1387. Here you have to find the number of points within a circle.
Better bullseye matrix
7 segment LED display
Back to basics 9 - Indexed References
Rotate input square matrix 90 degrees CCW without rot90
Create a Multiplication table matrix...
Celsius to Kelvin
Periodic Table 101.
Number of vertices of a hypercube
Special Relativity 101.
Change the sign
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