31155domain: NAppears in sequencesa(n) = Sum_{i=0..n-1} a(i) * a(n-i), a(0) = 1, a(1) = 5.at n=8A014434a(n) is the concatenation of n and 5n.at n=30A019553Numerators of continued fraction convergents to sqrt(811).at n=7A042564Numbers such that sigma(phi(tau(n)))=tau(phi(sigma(n))).at n=31A226119