Numbers that are not the sum of 2 squares.

Terms

a(0) =3a(1) =6a(2) =7a(3) =11a(4) =12a(5) =14a(6) =15a(7) =19a(8) =21a(9) =22a(10) =23a(11) =24a(12) =27a(13) =28a(14) =30a(15) =31a(16) =33a(17) =35a(18) =38a(19) =39a(20) =42a(21) =43a(22) =44a(23) =46a(24) =47a(25) =48a(26) =51a(27) =54a(28) =55a(29) =56