Least k such that decimal representation of k*n contains only digits 0 and 6.

Terms

a(0) =6a(1) =3a(2) =2a(3) =15a(4) =12a(5) =1a(6) =858a(7) =75a(8) =74a(9) =6a(10) =6a(11) =5a(12) =462a(13) =429a(14) =4a(15) =375a(16) =3918a(17) =37a(18) =3474a(19) =3a(20) =286a(21) =3a(22) =28722a(23) =25a(24) =24a(25) =231a(26) =24691358a(27) =2145a(28) =227814a(29) =2