286867domain: NAppears in sequencesT(n+2,2) with T as in A036355.at n=17A036681Smallest k such that 2^(2^n) + k is a safe prime.at n=8A360080G.f. A(x) satisfies A(x) = 1/( (1-x)^2 * (1 - x*A(x) - 2*x^2*A'(x)) ).at n=6A386263