Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 8.

Terms

a(0) =0a(1) =1a(2) =6a(3) =10a(4) =60a(5) =100a(6) =600a(7) =1000a(8) =6000a(9) =8131a(10) =10000a(11) =10301a(12) =10631a(13) =10801a(14) =31801a(15) =60000a(16) =60306a(17) =81310a(18) =100000a(19) =103010a(20) =103131a(21) =106310a(22) =108010a(23) =116881a(24) =136631a(25) =318010a(26) =600000a(27) =603060a(28) =813100a(29) =1000000