83252domain: NAppears in sequencesn*10^4-1, n*10^4-3, n*10^4-7 and n*10^4-9 are all prime.at n=24A064978Number of polyominoes consisting of 7 regular unit n-gons.at n=13A103473G.f.: -2*(-2 - 11*x - 4*x^2 + x^3)/(x - 1)^4.at n=24A152110G.f. A(x) satisfies A(x) = sqrt( (1 + 2*x*A(x))/(1 - 2*x*A(x)^3) ).at n=6A379383