Numbers k such that k and k^2 use only the digits 0, 1, 4, 5 and 9.

Terms

a(0) =0a(1) =1a(2) =10a(3) =100a(4) =951a(5) =1000a(6) =1049a(7) =9510a(8) =10000a(9) =10490a(10) =95100a(11) =99499a(12) =99501a(13) =100000a(14) =100499a(15) =100501a(16) =100549a(17) =100951a(18) =104451a(19) =104900a(20) =105549a(21) =951000a(22) =951549a(23) =994990a(24) =995010a(25) =1000000a(26) =1004990a(27) =1005010a(28) =1005490a(29) =1009510