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 6, Natural numbers, squares and sums.
Find nearest prime number less than input number
Doubling elements in a vector
Divisible by 15
Temperature Conversion Utility (Strings)
Scrabble Scores - 5
Divisible by 7
Combined Ages 3 - Non-symmetric, n ≥ 3
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