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.
Filter AC, pass DC
Back to basics 10 - Max Float
Replace May with April
Convert hex color specification to MATLAB RGB
Side of an equilateral triangle
Tune your guitar
Sum my indices
So many choices
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