Numbers k such that k and k^2 use only the digits 0, 1, 2, 5 and 8.

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) =151a(13) =285a(14) =500a(15) =501a(16) =505a(17) =1000a(18) =1001a(19) =1005a(20) =1010a(21) =1011a(22) =1050a(23) =1100a(24) =1101a(25) =1105a(26) =1500a(27) =1510a(28) =1585a(29) =2255