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.
Find the two-word state names
High school cafeteria
Project Euler: Problem 1, Multiples of 3 and 5
Length of the hypotenuse
Rule of mixtures (composites) - lower and upper bounds
Lights Out 8 - 5x5, light-only solution? I
Lights Out 10 - 5x5, with wrapping, 6 moves
Highly divisible triangular number (inspired by Project Euler 12)
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