130998domain: NAppears in sequencesNumbers k such that 243*2^k+1 is prime.at n=28A032498Numbers k such that 9*10^k - 19 is prime.at n=24A293278Triangle read by rows: T(n,k) is the total number of movable letters in all members of the k-partitions of [n], with 1 <= k <= n.at n=50A367468