a(n+1) = a(n) + its digital root.

Terms

a(0) =5a(1) =10a(2) =11a(3) =13a(4) =17a(5) =25a(6) =32a(7) =37a(8) =38a(9) =40a(10) =44a(11) =52a(12) =59a(13) =64a(14) =65a(15) =67a(16) =71a(17) =79a(18) =86a(19) =91a(20) =92a(21) =94a(22) =98a(23) =106a(24) =113a(25) =118a(26) =119a(27) =121a(28) =125a(29) =133