Numbers that are not the sum of 4 nonzero squares.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =8a(7) =9a(8) =11a(9) =14a(10) =17a(11) =24a(12) =29a(13) =32a(14) =41a(15) =56a(16) =96a(17) =128a(18) =224a(19) =384a(20) =512a(21) =896a(22) =1536a(23) =2048a(24) =3584a(25) =6144a(26) =8192a(27) =14336a(28) =24576a(29) =32768