Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 9.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =13a(6) =19a(7) =30a(8) =31a(9) =60a(10) =63a(11) =100a(12) =103a(13) =130a(14) =190a(15) =199a(16) =300a(17) =301a(18) =306a(19) =310a(20) =369a(21) =600a(22) =603a(23) =630a(24) =1000a(25) =1003a(26) =1030a(27) =1300a(28) =1900a(29) =1990