Write a function to determine whether or not the matrix is a projector. Projector matrices are defined as P^2 = P.
test 8 is not a symmetric matrix, is it a projector matrix?
Sorry about that one. I've removed that test case. I don't know how long it will take for the re-scoring to propagate, though.
Distance walked 1D
Permute diagonal and antidiagonal
Replace multiples of 5 with NaN
Scrabble Scores - 6
Divisible by 5
Rule of mixtures (composites) - upper bound
Divisible by 4
Divisible by 15
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