Digits of prime factors of k do not appear in k.

Terms

a(0) =1a(1) =4a(2) =6a(3) =8a(4) =9a(5) =10a(6) =14a(7) =16a(8) =18a(9) =21a(10) =27a(11) =34a(12) =38a(13) =40a(14) =44a(15) =46a(16) =48a(17) =49a(18) =54a(19) =56a(20) =57a(21) =58a(22) =60a(23) =64a(24) =66a(25) =68a(26) =69a(27) =76a(28) =78a(29) =80