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.
Test for balanced parentheses
Prime factor digits
Generate N equally spaced intervals between -L and L
Create a Multiplication table matrix...
Flip the vector from right to left
Great Circle Distance
Return the Nth Output from an Input Command
Next Higher Power of B
Number of 1s in the Binary Representation of a Number
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
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