Numbers that are primitively but not imprimitively represented by x^2+xy+y^2.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =13a(5) =19a(6) =21a(7) =31a(8) =37a(9) =39a(10) =43a(11) =57a(12) =61a(13) =67a(14) =73a(15) =79a(16) =91a(17) =93a(18) =97a(19) =103a(20) =109a(21) =111a(22) =127a(23) =129a(24) =133a(25) =139a(26) =151a(27) =157a(28) =163a(29) =181