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.
Return a list sorted by number of occurrences
Find common elements in matrix rows
Implement a ROT13 cipher
Sophie Germain prime
Who invented zero?
Maintain shape of logical-index mask
Sum my indices
All your base are belong to us
So many choices
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