Given a number, return the number of closed 'circles' in the base 10 numerical representation.
Note: the number 4 has no circles
8819 -> 5
Interpolating on a string (the ASCII values) is an interesting idea even though the long interpolation string could be reduced by subtracting '0', but at the expense of a "longer" solution.
Remove the polynomials that have positive real elements of their roots.
Indexed Probability Table
Sum of diagonals elements of a matrix
First N Perfect Squares
Triangle Numbers Below N
The Dark Side of the Die
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