Numbers k such that k and k^2 use only the digits 0, 1, 3 and 6.

Terms

a(0) =0a(1) =1a(2) =6a(3) =10a(4) =60a(5) =100a(6) =600a(7) =1000a(8) =6000a(9) =10000a(10) =10301a(11) =60000a(12) =100000a(13) =103010a(14) =103131a(15) =600000a(16) =1000000a(17) =1003001a(18) =1030100a(19) =1031310a(20) =6000000a(21) =10000000a(22) =10030010a(23) =10301000a(24) =10313100a(25) =60000000a(26) =100000000a(27) =100030001a(28) =100300100a(29) =103010000