Numbers that are not the sum of a square (A000290) and a triangular number (A000217).

Terms

a(0) =8a(1) =13a(2) =18a(3) =20a(4) =23a(5) =27a(6) =33a(7) =34a(8) =38a(9) =41a(10) =43a(11) =47a(12) =48a(13) =58a(14) =60a(15) =62a(16) =63a(17) =68a(18) =69a(19) =73a(20) =76a(21) =83a(22) =86a(23) =88a(24) =89a(25) =90a(26) =93a(27) =97a(28) =98a(29) =99