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.
Basic electricity in a dry situation
System of equations
Back to basics 26 - Keywords
Numbers in extended form
Divisible by n, prime divisors - 11, 13, 17, & 19
Consecutive Equation Times (of the day)
Lights Out 13 - 5x5, three stages, x moves
Divisible by 2
Lights Out 4 - 5x5, 8 moves
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