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

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =11a(5) =12a(6) =21a(7) =46a(8) =111a(9) =121a(10) =146a(11) =162a(12) =462a(13) =642a(14) =1111a(15) =1146a(16) =1632a(17) =3621a(18) =3642a(19) =4611a(20) =4631a(21) =6642a(22) =11142a(23) =11146a(24) =33632a(25) =34121a(26) =36361a(27) =36642a(28) =46111a(29) =211262