Has both a primitive and imprimitive representation as x^2 + xy + y^2.

Terms

a(0) =49a(1) =147a(2) =169a(3) =343a(4) =361a(5) =507a(6) =637a(7) =931a(8) =961a(9) =1029a(10) =1083a(11) =1183a(12) =1369a(13) =1519a(14) =1813a(15) =1849a(16) =1911a(17) =2107a(18) =2197a(19) =2401a(20) =2527a(21) =2793a(22) =2883a(23) =2989a(24) =3211a(25) =3283a(26) =3549a(27) =3577a(28) =3721a(29) =3871