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.
Remove the vowels
Check to see if a Sudoku Puzzle is Solved
Make a simplified barcode
Is X a Fibonacci Matrix?
Mysterious digits operation (easy)
Periodic Table 101.
Celsius to Fahrenheit converter
The almost-birthday problem.
Fahrenheit to Celsius converter
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