Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 9.

Terms

a(0) =1a(1) =3a(2) =5a(3) =11a(4) =15a(5) =23a(6) =35a(7) =39a(8) =111a(9) =115a(10) =123a(11) =139a(12) =235a(13) =315a(14) =335a(15) =1235a(16) =1239a(17) =1515a(18) =1523a(19) =2315a(20) =3335a(21) =3515a(22) =3911a(23) =11515a(24) =12335a(25) =13911a(26) =15911a(27) =23515a(28) =23523a(29) =31515