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

Terms

a(0) =0a(1) =1a(2) =5a(3) =10a(4) =11a(5) =15a(6) =50a(7) =100a(8) =101a(9) =105a(10) =110a(11) =150a(12) =500a(13) =501a(14) =505a(15) =1000a(16) =1001a(17) =1005a(18) =1010a(19) =1011a(20) =1050a(21) =1100a(22) =1101a(23) =1105a(24) =1500a(25) =5000a(26) =5001a(27) =5005a(28) =5010a(29) =5011