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.
Project Euler: Problem 8, Find largest product in a large string of numbers
Largest Twin Primes
convert matrix to single column
05 - Vector Equations 3
First N Perfect Squares
Test if a Number is a Palindrome without using any String Operations
Number of 1s in the Binary Representation of a Number
Reverse the Words (not letters) of a String
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