57300domain: NAppears in sequencesNumbers k such that 2*k-1, 4*k-1, 6*k-1 and 8*k-1 are primes.at n=29A124487E.g.f. A(x) = (1 + Integral A(x) dx) * (1 + Integral A(x)^2 dx).at n=6A322738