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.
Clock Hand Angle 1
Back to basics 23 - Triangular matrix
sum of non-primes
Who has power to do everything in this world?
Area of an Isoceles Triangle
Increment a number, given its digits
Maintain shape of logical-index mask
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