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

Terms

a(0) =4a(1) =9a(2) =12a(3) =16a(4) =25a(5) =27a(6) =28a(7) =36a(8) =48a(9) =52a(10) =63a(11) =64a(12) =75a(13) =76a(14) =81a(15) =84a(16) =100a(17) =108a(18) =112a(19) =117a(20) =121a(21) =124a(22) =144a(23) =148a(24) =156a(25) =171a(26) =172a(27) =175a(28) =189a(29) =192