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.
Check to see if a Sudoku Puzzle is Solved
Angle of triangle
Replicate elements in vectors
intersection of matrices
Factorize THIS, buddy
Are you in or are you out?
Flip the bit
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