I'd suggest adding test cases in which n (or abs(n)) is larger than the dimension of x; for example, x is a 4-by-4 matrix and n = 6.
smooth~ basically same idea, my solution however is bit of inflexible.
Will work also for non-square input matrix x.
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Project Euler: Problem 10, Sum of Primes
Who knows the last digit of pi?
Sum the elements in either diagonal of a square matrix
create a circulant matrix
Find my secret function II
Divisible by 21
Find my secret function III
Who have the chance?
Hilbert Scan Algorithm
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