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.
So many choices
Getting the row and column location from a matrix
What number has this problem?
Singular Value Decomposition
Lights Out 30 - 3x4x5, x moves
Large Sum (inspired by Project Euler 13)
Divisible by n, prime divisors - 11, 13, 17, & 19
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