Numbers of form x^2 + xy + y^2 with distinct x and y > 0.

Terms

a(0) =7a(1) =13a(2) =19a(3) =21a(4) =28a(5) =31a(6) =37a(7) =39a(8) =43a(9) =49a(10) =52a(11) =57a(12) =61a(13) =63a(14) =67a(15) =73a(16) =76a(17) =79a(18) =84a(19) =91a(20) =93a(21) =97a(22) =103a(23) =109a(24) =111a(25) =112a(26) =117a(27) =124a(28) =127a(29) =129