Everyone, I've modified the test suite such that common cheats won't work; i.e., regexp/rep, interp1/2/3, num2str, str2num, etc. are disallowed! General numerical solutions, however, are most welcome.
Back and Forth Rows
Which values occur exactly three times?
The Tower of Hanoi
Edges of a n-dimensional Hypercube
Dots in a Sphere
Volume of a Simplex
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