Smallest number whose sum of digits is 2n+1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =29a(6) =49a(7) =69a(8) =89a(9) =199a(10) =399a(11) =599a(12) =799a(13) =999a(14) =2999a(15) =4999a(16) =6999a(17) =8999a(18) =19999a(19) =39999a(20) =59999a(21) =79999a(22) =99999a(23) =299999a(24) =499999a(25) =699999a(26) =899999a(27) =1999999a(28) =3999999a(29) =5999999