(Cubes of positive numbers) that are not the sum of three nonzero squares.

Terms

a(0) =1a(1) =8a(2) =64a(3) =343a(4) =512a(5) =3375a(6) =4096a(7) =12167a(8) =21952a(9) =29791a(10) =32768a(11) =59319a(12) =103823a(13) =166375a(14) =216000a(15) =250047a(16) =262144a(17) =357911a(18) =493039a(19) =658503a(20) =778688a(21) =857375a(22) =1092727a(23) =1367631a(24) =1404928a(25) =1685159a(26) =1906624a(27) =2048383a(28) =2097152a(29) =2460375