Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 8.

Terms

a(0) =1a(1) =4a(2) =6a(3) =8a(4) =38a(5) =41a(6) =344a(7) =1146a(8) =1188a(9) =3381a(10) =3444a(11) =3631a(12) =6441a(13) =8131a(14) =11481a(15) =33688a(16) =68131a(17) =81344a(18) =116881a(19) =136441a(20) =333641a(21) =338646a(22) =364844a(23) =364881a(24) =384881a(25) =431441a(26) =681441a(27) =1146481a(28) =1366881a(29) =1861146