59752621657domain: NAppears in sequencesa(n) = 2*a(n-1) + 7*a(n-2).at n=18A083100a(n) = 2*a(n-1) + 7*a(n-2) for n>1, a(0)=1, a(1)=1.at n=19A084058Prime numbers in A084058.at n=5A111013