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.
Remove any row in which a NaN appears
Project Euler: Problem 8, Find largest product in a large string of numbers
Back to basics 14 - Keywords
Multiply 2 numbers
Vectors counting by 2
Determine if a Given Number is a Triangle Number
Roll the Dice!
Clock Hand Angle 1
N-Dimensional Array Slice
Lychrel Number Test (Inspired by Project Euler Problem 55)
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