Numbers k such that k and k^2 use only the digits 1, 3, 6, 8 and 9.

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =13a(5) =19a(6) =31a(7) =63a(8) =83a(9) =369a(10) =619a(11) =631a(12) =833a(13) =836a(14) =969a(15) =3633a(16) =8131a(17) =31131a(18) =36313a(19) =81619a(20) =81813a(21) =81833a(22) =93869a(23) =93986a(24) =96886a(25) =98336a(26) =116881a(27) =191881a(28) =336333a(29) =816313