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.
Project Euler: Problem 1, Multiples of 3 and 5
Make one big string out of two smaller strings
Change the sign of even index entries of the reversed vector
Mirror Image matrix across anti-diagonal
Periodic Table 101.
Celsius to Fahrenheit converter
Change the sign
Special Relativity 101.
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