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.
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 3, Largest prime factor
Stuff the Board
Area of an equilateral triangle
Is this triangle right-angled?
Basic arrays operations.
Fahrenheit to Celsius converter
Periodic Table 101.
Celsius to Kelvin
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