Smallest composite number with digit sum n.

Terms

a(0) =10a(1) =20a(2) =12a(3) =4a(4) =14a(5) =6a(6) =16a(7) =8a(8) =9a(9) =28a(10) =38a(11) =39a(12) =49a(13) =68a(14) =69a(15) =88a(16) =98a(17) =99a(18) =289a(19) =299a(20) =399a(21) =589a(22) =689a(23) =699a(24) =799a(25) =899a(26) =999a(27) =2899a(28) =3899a(29) =3999