43089domain: NAppears in sequencesa(n) = floor((3^n)/(3*n - 2)).at n=12A191628Number of primes contained in the concatenations of the length-1 to length-n partial permutations of {1,..., n}.at n=8A224716Numbers k such that (85*10^k - 103)/9 is prime.at n=23A290433