31810domain: NAppears in sequencesNumbers k such that 10^k + 9 is prime.at n=17A088275Number of length 3+1 0..2*n arrays with the sum of the absolute values of adjacent differences equal to 3*n.at n=19A249983Maximal term of TRIP-Stern sequence of level n corresponding to permutation triple (e,13,23).at n=30A271486