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.
Project Euler: Problem 2, Sum of even Fibonacci
Getting logical indexes
Replace multiples of 5 with NaN
03 - Matrix Variables 4
Sum my indices
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