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.
The Goldbach Conjecture
letter yes yes & letter no no
Number of 1s in a binary string
Find nth maximum
Sum of odd numbers in a matrix
Lights Out 1 - 5x5, 3 moves
Word Search Solver
Divisible by n, prime divisors from 20 to 200
Lights Out 10 - 5x5, with wrapping, 6 moves
Calculator spelling - Letters to Numbers
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