Possible digital sums of Smith numbers (conjectural).

Terms

a(0) =4a(1) =9a(2) =13a(3) =15a(4) =17a(5) =18a(6) =19a(7) =20a(8) =21a(9) =22a(10) =23a(11) =24a(12) =25a(13) =26a(14) =27a(15) =28a(16) =29a(17) =30a(18) =31a(19) =32a(20) =33a(21) =34a(22) =35a(23) =36a(24) =37a(25) =38a(26) =39a(27) =40a(28) =41a(29) =42