150940domain: NAppears in sequencesNumbers k such that k*18^k + 1 is prime.at n=10A007648G.f.: A(x) = Product_{n>=1} 1/(1 - A_n(x)^n) where A_n(x) denotes the n-th iteration of A(x): A_n(x) = A_{n-1}(A(x)) with A_0(x)=x.at n=8A182970