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.
Prime factor digits
Longest run of consecutive numbers
Replace Nonzero Numbers with 1
Divisible by 4
Stress-Strain Properties - 3
Legend of Zelda - Rupee Count (Compact)
Divisible by 3
Lights Out 9 - 5x5, light-only solution? II
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