Perfect powers that are not of the form x^2 + y^2 + z^2 where x, y and z are integers.

Terms

a(0) =343a(1) =3375a(2) =12167a(3) =16807a(4) =21952a(5) =29791a(6) =59319a(7) =103823a(8) =166375a(9) =216000a(10) =250047a(11) =357911a(12) =493039a(13) =658503a(14) =759375a(15) =778688a(16) =823543a(17) =857375a(18) =1092727a(19) =1367631a(20) =1404928a(21) =1685159a(22) =1906624a(23) =2048383a(24) =2460375a(25) =2924207a(26) =3442951a(27) =3796416a(28) =4019679a(29) =4657463