Prime powers p^k (p prime, k > 1) that are not of the form x^2 + y^2 + z^2 where x, y and z are integers.

A270820

Prime powers p^k (p prime, k > 1) that are not of the form x^2 + y^2 + z^2 where x, y and z are integers.

Terms

    a(0) =343a(1) =12167a(2) =16807a(3) =29791a(4) =103823a(5) =357911a(6) =493039a(7) =823543a(8) =1092727a(9) =2048383a(10) =3442951a(11) =4657463a(12) =6436343a(13) =6967871a(14) =7880599a(15) =11089567a(16) =13651919a(17) =18191447a(18) =19902511a(19) =28629151a(20) =30080231a(21) =40353607a(22) =46268279a(23) =49430863a(24) =56181887a(25) =80062991a(26) =84604519a(27) =99252847

External references