Both primitively and imprimitively represented by x^2+2y^2.

Terms

a(0) =9a(1) =18a(2) =27a(3) =54a(4) =81a(5) =99a(6) =121a(7) =153a(8) =162a(9) =171a(10) =198a(11) =242a(12) =243a(13) =289a(14) =297a(15) =306a(16) =342a(17) =361a(18) =363a(19) =369a(20) =387a(21) =459a(22) =486a(23) =513a(24) =531a(25) =578a(26) =594a(27) =603a(28) =657a(29) =722