85647domain: NAppears in sequencesG.f. satisfies: A(x) = A(x^2)^2 + x*A(x^2)^3.at n=33A174512Numbers k such that 7*R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=20A256426Number of compositions (ordered partitions) of n into distinct parts >= 4.at n=51A339102