Imprimitively but not primitively represented by x^2+y^2.

Terms

a(0) =4a(1) =8a(2) =9a(3) =16a(4) =18a(5) =20a(6) =32a(7) =36a(8) =40a(9) =45a(10) =49a(11) =52a(12) =64a(13) =68a(14) =72a(15) =80a(16) =81a(17) =90a(18) =98a(19) =100a(20) =104a(21) =116a(22) =117a(23) =121a(24) =128a(25) =136a(26) =144a(27) =148a(28) =153a(29) =160