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

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =13a(5) =19a(6) =31a(7) =36a(8) =63a(9) =96a(10) =111a(11) =139a(12) =263a(13) =369a(14) =1123a(15) =1619a(16) =2631a(17) =3161a(18) =3361a(19) =3623a(20) =6296a(21) =9963a(22) =11119a(23) =12911a(24) =16313a(25) =16339a(26) =19213a(27) =19219a(28) =31131a(29) =33611