Numbers k such that k^2 contains only digits {1,3,6}.

Terms

a(0) =1a(1) =4a(2) =6a(3) =19a(4) =56a(5) =369a(6) =796a(7) =1146a(8) =1156a(9) =3656a(10) =8131a(11) =19056a(12) =40204a(13) =81619a(14) =258131a(15) =5624381a(16) =24762131a(17) =362789631a(18) =1079982019a(19) =11666754546a(20) =562726517354