1718371domain: NPropertiesPrimalityPrimeyesAppears in sequencesCoefficient of x^2 in minimal polynomial of the continued fraction [1^n,phi,1,1,1,...], where 1^n means n ones and phi = golden ratio = (1 + sqrt(5))/2.at n=15A266707a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 1, a(1) = 1, a(2) = 4, a(3) = -3.at n=34A295677Prime numbersat n=129407