Smallest number with n = sum of distinct digits in decimal representation, cf. A217928.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =19a(11) =29a(12) =39a(13) =49a(14) =59a(15) =69a(16) =79a(17) =89a(18) =189a(19) =289a(20) =389a(21) =489a(22) =589a(23) =689a(24) =789a(25) =1789a(26) =2789a(27) =3789a(28) =4789a(29) =5789