38922domain: NAppears in sequencesG.f. A(x) satisfies: A(x)^2 equals the g.f. of A110637, which consists entirely of numbers 1 through 8.at n=18A112571Averages q of twin prime pairs, such that q concatenated to q is also the average of a twin prime pair.at n=34A235109Numbers k for which A354102(k) = A354102(sigma(k)).at n=24A354106