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.
Implement a ROT13 cipher
Make one big string out of two smaller strings
Vectorize the digits of an Integer
Make a 1 hot vector
select the primes of a vector
Factorize THIS, buddy
Right and wrong
Is my wife right?
Maintain shape of logical-index mask
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