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.
Check if sorted
Replace multiples of 5 with NaN
Solving Quadratic Equations (Version 1)
Return the 'Size' of a String of Code
ASCII Birthday Cake
Guess the Coefficients!
Project Euler: Problem 16, Sums of Digits of Powers of Two
Next Lower Power of B
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