43269domain: NAppears in sequencesNumbers k such that 10^999 + k is a (titanic) prime.at n=25A074282Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled nodes with k arcs and a global source and sink, n >= 1, k = 0..max(1,n-1)*(n-2)+1.at n=61A350795