Numbers k such that k and k^2 use only the digits 1, 4, 6, 8 and 9.

Terms

a(0) =1a(1) =4a(2) =8a(3) =9a(4) =14a(5) =41a(6) =119a(7) =141a(8) =441a(9) =446a(10) =696a(11) =946a(12) =1191a(13) =4119a(14) =6441a(15) =9469a(16) =9486a(17) =41191a(18) =44119a(19) =66969a(20) =69641a(21) =81619a(22) =98446a(23) =98488a(24) =118941a(25) =119114a(26) =441191a(27) =644196a(28) =646886a(29) =664191