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 palindrome
Project Euler: Problem 2, Sum of even Fibonacci
Determine if input is a Narcissistic number
sum of non-primes
05 - Vector Equations 2
Rule of mixtures (composites) - upper bound
Musical Note Interval 1 - Diatonic Scale
Scrabble Scores - 5
Divisible by n, Composite Divisors
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