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.
Tune your guitar
Find the "ordinary" or Euclidean distance between A and Z
Calculate the area of a triangle between three points
Volume of a sphere given its surface area
Factorize THIS, buddy
All your base are belong to us
The Hitchhiker's Guide to MATLAB
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