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.
Add two numbers
Find the numeric mean of the prime numbers in a matrix.
Sums with Excluded Digits
Back to basics 15 - classes
Back to basics 20 - singleton dimensions
The almost-birthday problem.
Special Relativity 101.
Fahrenheit to Celsius converter
Periodic Table II 101.
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