Numbers k such that k^2 contains only digits {1,4,8}.

Terms

a(0) =1a(1) =2a(2) =9a(3) =12a(4) =21a(5) =22a(6) =29a(7) =38a(8) =109a(9) =122a(10) =221a(11) =1191a(12) =20359a(13) =12017441a(14) =64352012a(15) =69362229a(16) =105741122a(17) =1347014779a(18) =10715008859a(19) =664190348029a(20) =940313186572