Numbers k such that k and k^2 use only the digits 0, 1, 2, 5 and 6.

Terms

a(0) =0a(1) =1a(2) =5a(3) =10a(4) =11a(5) =15a(6) =16a(7) =25a(8) =50a(9) =51a(10) =100a(11) =101a(12) =105a(13) =110a(14) =125a(15) =150a(16) =160a(17) =225a(18) =250a(19) =255a(20) =500a(21) =501a(22) =505a(23) =510a(24) =511a(25) =515a(26) =516a(27) =1000a(28) =1001a(29) =1005