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.
Times 2 - START HERE
Remove the air bubbles
Number of 1s in the Binary Representation of a Number
Project Euler: Problem 3, Largest prime factor
Change the sign
Special Relativity 101.
Fahrenheit to Celsius converter
Number of vertices of a hypercube
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