Numbers k such that k^2 contains only digits {4,6,9}.

Terms

a(0) =2a(1) =3a(2) =7a(3) =8a(4) =212a(5) =264a(6) =2236a(7) =3114a(8) =3157a(9) =31614a(10) =68187a(11) =254842a(12) =80434114a(13) =263527313a(14) =3073591864a(15) =6670791907a(16) =21134016762a(17) =21610059386a(18) =97312381892