Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.

Terms

a(0) =3942a(1) =4392a(2) =5796a(3) =7956a(4) =11738a(5) =11963a(6) =13196a(7) =13692a(8) =13698a(9) =13724a(10) =13742a(11) =13942a(12) =14237a(13) =14392a(14) =14673a(15) =14693a(16) =15473a(17) =15737a(18) =15873a(19) =15942a(20) =15948a(21) =16473a(22) =17357a(23) =17358a(24) =17381a(25) =17438a(26) =17453a(27) =17458a(28) =17463a(29) =18559