41774domain: NAppears in sequencesNumbers k such that 2^k - 23 is prime.at n=21A057220Number of (n+2) X 4 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=27A202441Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=33A296025