If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Sums with Excluded Digits
Number of 1s in the Binary Representation of a Number
Calculate the area of a triangle between three points
Back to basics - mean of corner elements of a matrix
Integer sequence - 2 : Kolakoski sequence
Combined Ages 1 - Symmetric, n = 3
Consecutive Equation Times (of the day)
Combined Ages 2 - Symmetric, n ≥ 3
Dice roll - lateral faces
Divisible by 6
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