31291domain: NAppears in sequencesG.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - x)) / (1 - x)^4.at n=10A351283Numerators of the partial sums of the reciprocals of the Dedekind psi function (A001615).at n=29A357818Composite numbers k such that k is a substring of A067599(k).at n=11A390475