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.
Make a run-length companion vector
Multiples of a Number in a Given Range
Integer Sequence - II : New Fibonacci
Celsius to Kelvin
The almost-birthday problem.
Periodic Table 101.
Number of vertices of a hypercube
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