Numbers k such that k and k^2 use only the digits 0, 1, 2, 6 and 8.

Terms

a(0) =0a(1) =1a(2) =10a(3) =11a(4) =100a(5) =101a(6) =110a(7) =261a(8) =1000a(9) =1001a(10) =1010a(11) =1011a(12) =1100a(13) =1101a(14) =2610a(15) =10000a(16) =10001a(17) =10010a(18) =10011a(19) =10100a(20) =10110a(21) =10801a(22) =11000a(23) =11001a(24) =11010a(25) =11261a(26) =26100a(27) =26101a(28) =100000a(29) =100001