1013985domain: NAppears in sequencesa(n) = a(n-1) - (n-1)*a(n-4), with a(0) = 0, a(1) = 1, a(2) = 2, a(3) = 1.at n=22A122022Integers k such that the equation A034699(k)=x has more than one solution in the range [prevprime(k), nextprime(k)].at n=13A308752