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.
Extract leading non-zero digit
Back to basics 1 - Saving
Make a random, non-repeating vector.
Wrapping the Tower of Pisa
Parse me a Lisp
First N Perfect Squares
THE CALCULATOR OF LOVE
Project Euler: Problem 16, Sums of Digits of Powers of Two
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