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 17 - white space
Back to basics 23 - Triangular matrix
Multiples of a Number in a Given Range
Create matrix of replicated elements
The sum of the numbers in the vector
The Hitchhiker's Guide to MATLAB
Factorize THIS, buddy
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