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.
Times 2 - START HERE
Remove NaN ?
Numbers with prime factors 2, 3 and 5.
MATCH THE STRINGS (2 CHAR) very easy
Sum my indices
Is my wife right? Now with even more wrong husband
Maintain shape of logical-index mask
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