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

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =12a(5) =14a(6) =21a(7) =46a(8) =96a(9) =114a(10) =119a(11) =121a(12) =129a(13) =162a(14) =212a(15) =264a(16) =469a(17) =642a(18) =964a(19) =1292a(20) =1619a(21) =1642a(22) =2161a(23) =2629a(24) =4114a(25) =4119a(26) =4921a(27) =4946a(28) =4962a(29) =4964