Check whether the input matrix is a figurate number triangle: http://mathworld.wolfram.com/FigurateNumberTriangle.html
you should probably add a test case where the correct answer is false.
I added a few more tests as suggested.
Most nonzero elements in row
Find the largest value in the 3D matrix
Find Index of maximum Value and maximum Value of a vector
Generate a NaN...on purpose
03 - Matrix Variables 6
High school cafeteria
All your base are belong to us
Sum my indices
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