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.
Get the area codes from a list of phone numbers
Numbers with prime factors 2, 3 and 5.
Replace multiples of 5 with NaN
Find the logic
Word Distance - Sum
Rumis Scorer 3
Divisible by n, prime vs. composite divisors
Lights Out 14 - 5x5, four stages, x moves
Highly divisible triangular number (inspired by Project Euler 12)
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