Primes at which sum of digits strictly increases.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =17a(5) =19a(6) =29a(7) =59a(8) =79a(9) =89a(10) =199a(11) =389a(12) =499a(13) =599a(14) =997a(15) =1889a(16) =1999a(17) =2999a(18) =4999a(19) =6899a(20) =8999a(21) =29989a(22) =39989a(23) =49999a(24) =59999a(25) =79999a(26) =98999a(27) =199999a(28) =389999a(29) =598999