Numbers k such that k and k^2 use only the digits 0, 1, 3, 5 and 9.

Terms

a(0) =0a(1) =1a(2) =3a(3) =10a(4) =30a(5) =100a(6) =300a(7) =1000a(8) =3000a(9) =10000a(10) =10503a(11) =30000a(12) =30501a(13) =100000a(14) =105030a(15) =300000a(16) =305010a(17) =550501a(18) =550503a(19) =1000000a(20) =1005003a(21) =1050300a(22) =1055003a(23) =3000000a(24) =3005001a(25) =3050100a(26) =3055001a(27) =5505010a(28) =5505030a(29) =10000000