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

Terms

a(0) =0a(1) =1a(2) =10a(3) =100a(4) =1000a(5) =10000a(6) =10801a(7) =100000a(8) =108010a(9) =1000000a(10) =1008001a(11) =1080100a(12) =10000000a(13) =10080010a(14) =10801000a(15) =100000000a(16) =100080001a(17) =100800100a(18) =108010000a(19) =1000000000a(20) =1000800010a(21) =1008001000a(22) =1080100000a(23) =10000000000a(24) =10000800001a(25) =10008000100a(26) =10080010000a(27) =10801000000a(28) =100000000000a(29) =100008000010