Numbers k such that k and k^2 use only the digits 0, 1, 4, 6 and 9.

Terms

a(0) =0a(1) =1a(2) =4a(3) =10a(4) =14a(5) =40a(6) =64a(7) =100a(8) =119a(9) =140a(10) =400a(11) =640a(12) =949a(13) =1000a(14) =1046a(15) =1049a(16) =1190a(17) =1400a(18) =4000a(19) =4119a(20) =6400a(21) =9490a(22) =10000a(23) =10199a(24) =10460a(25) =10490a(26) =10496a(27) =10696a(28) =11900a(29) =14000