Numbers k such that k and k^2 use only the digits 0, 1, 3, 4 and 5.

Terms

a(0) =0a(1) =1a(2) =10a(3) =100a(4) =1000a(5) =10000a(6) =100000a(7) =100501a(8) =550501a(9) =551501a(10) =1000000a(11) =1005010a(12) =5505010a(13) =5515010a(14) =10000000a(15) =10005001a(16) =10050100a(17) =10055001a(18) =55050100a(19) =55055001a(20) =55150100a(21) =100000000a(22) =100050010a(23) =100501000a(24) =100550010a(25) =550501000a(26) =550550010a(27) =551501000a(28) =1000000000a(29) =1000050001