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

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =7a(5) =9a(6) =12a(7) =13a(8) =16a(9) =19a(10) =21a(11) =25a(12) =27a(13) =28a(14) =31a(15) =36a(16) =37a(17) =39a(18) =43a(19) =48a(20) =52a(21) =57a(22) =61a(23) =63a(24) =64a(25) =67a(26) =73a(27) =75a(28) =76a(29) =79