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.
Word Counting and Indexing
Sort numbers by outside digits
Test if two numbers have the same digits
Symmetry of vector
Area of a triangle
Guess the Coefficients!
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Check to see if a Sudoku Puzzle is Solved
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