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.
Back to basics 23 - Triangular matrix
Replicate elements in vectors
Is this triangle right-angled?
Find a Pythagorean triple
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Self-similarity 1 - Every other term
Rule of mixtures (composites) - lower bound
Evened up (or not)
Divisible by 12
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