1337476domain: NAppears in sequences"DHK" (bracelet, identity, unlabeled) transform of 2,2,2,2,...at n=16A032251Least positive integer multiples of angle x such that their direction cosines form a unit vector: Sum_{k>0} cos(a(k)*x)^2 = 1, where a(1)=1 and x=3.at n=24A080138