99803domain: NAppears in sequencesn*10^6-1, n*10^6-3, n*10^6-7 and n*10^6-9 are all prime.at n=9A064980Numbers k such that k and k^2 use only the digits 0, 3, 6, 8 and 9.at n=53A136945G.f. satisfies: A(x) = 1/(1 - x/A(-x*A(x)^5)).at n=9A213226Expansion of Product_{k>=1} 1/((1 - x^k)*(1 - x^(4*k))).at n=40A318027