121537domain: NAppears in sequencesa(n) = floor(n*phi^19), where phi is the golden ratio, A001622.at n=13A004934a(n) = round(n*phi^19), where phi is the golden ratio, A001622.at n=13A004954Strong pseudoprimes to base 73.at n=29A020299Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x)=1+x^n+x^(2n+2).at n=11A192473