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
Longest Divisor Run
Return the Fibonacci Sequence
String substitution, sub problem to cryptoMath
Spot the First Occurrence of 5
Rumis Scorer 1
Lights Out 1 - 5x5, 3 moves
Word Search Solver
Is it really a 5?
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