Numbers k such that k and k^2 use only the digits 1, 4, 5, 6 and 9.

Terms

a(0) =1a(1) =4a(2) =14a(3) =119a(4) =4116a(5) =4119a(6) =4466a(7) =6454a(8) =95454a(9) =956554a(10) =956619a(11) =959166a(12) =4116619a(13) =6415696a(14) =6441616a(15) =6445616a(16) =6446669a(17) =6641946a(18) =6644546a(19) =9959514a(20) =41169669a(21) =44665419a(22) =64466669a(23) =66644546a(24) =95469446a(25) =95469469a(26) =95611696a(27) =441544966a(28) =644666669a(29) =664499166