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 1 - Saving
Back to basics 18 - justification
Getting logical indexes
What number has this problem?
Compare two input matrices
Tune your guitar
Maintain shape of logical-index mask
Factorize THIS, buddy
High school cafeteria
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