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.
Extract leading non-zero digit
Find best domino orientation
Golomb's self-describing sequence (based on Euler 341)
Divisible by 3
Periodic Table II 101.
Periodic Table 101.
Special Relativity 101.
Number of vertices of a hypercube
Change the sign
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