a(n+1) = a(n) + digital root (A010888) of a(n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =23a(6) =28a(7) =29a(8) =31a(9) =35a(10) =43a(11) =50a(12) =55a(13) =56a(14) =58a(15) =62a(16) =70a(17) =77a(18) =82a(19) =83a(20) =85a(21) =89a(22) =97a(23) =104a(24) =109a(25) =110a(26) =112a(27) =116a(28) =124a(29) =131