Numbers k such that k and k^2 use only the digits 0, 1, 2, 8 and 9.

Terms

a(0) =0a(1) =1a(2) =9a(3) =10a(4) =11a(5) =90a(6) =91a(7) =99a(8) =100a(9) =101a(10) =109a(11) =110a(12) =899a(13) =900a(14) =901a(15) =910a(16) =911a(17) =990a(18) =991a(19) =999a(20) =1000a(21) =1001a(22) =1009a(23) =1010a(24) =1011a(25) =1090a(26) =1091a(27) =1100a(28) =1101a(29) =1109