Cubes which are not the sum of three squares.

Terms

a(0) =343a(1) =3375a(2) =12167a(3) =21952a(4) =29791a(5) =59319a(6) =103823a(7) =166375a(8) =216000a(9) =250047a(10) =357911a(11) =493039a(12) =658503a(13) =778688a(14) =857375a(15) =1092727a(16) =1367631a(17) =1404928a(18) =1685159a(19) =1906624a(20) =2048383a(21) =2460375a(22) =2924207a(23) =3442951a(24) =3796416a(25) =4019679a(26) =4657463a(27) =5359375a(28) =6128487a(29) =6644672