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.
Remove the vowels
Implement a ROT13 cipher
Permute diagonal and antidiagonal
What's Your BMI?
Sum the numbers on the main diagonal
Sphenic number sequence
Power Times (of the day)
Cycling — Critical Power
Highly divisible triangular number (inspired by Project Euler 12)
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