Numbers whose digits are distinct nonprimes and are not a permutation of a smaller such number.

Terms

a(0) =0a(1) =1a(2) =4a(3) =6a(4) =8a(5) =9a(6) =10a(7) =14a(8) =16a(9) =18a(10) =19a(11) =40a(12) =46a(13) =48a(14) =49a(15) =60a(16) =68a(17) =69a(18) =80a(19) =89a(20) =90a(21) =104a(22) =106a(23) =108a(24) =109a(25) =146a(26) =148a(27) =149a(28) =168a(29) =169