Note that all solutions (which passed the limited test suite with small size) involving only pair-wise gcd calculations are indeed incorrect. Those solutions include the following ones: 1) min(gcd(a,min(a))); 2) min(gcd(a(1), a)); 3) min(min(bsxfun(@gcd,a,a.'))); To eliminate these incorrect solutions, please simply add a test case with a = [21 15 35].
Back to basics 18 - justification
Getting the indices from a vector
Basics: 'Find the eigenvalues of given matrix
swap sign sum & multiply castles
Angle of triangle
Minimum possible M of the maximum side of a triangle of given area A.
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