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.
Project Euler: Problem 3, Largest prime factor
Return the first and last character of a string
Predicting life and death of a memory-less light bulb
Divisible by 14
I Plead the Fifth
Combined Ages 1 - Symmetric, n = 3
Scrabble Scores - 13
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