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.
Back to basics 7 - Equal NaNs
Spot the outlier
Given area find sides
Length of the hypotenuse
Is my wife right? Now with even more wrong husband
Sum my indices
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