a(1) = 3; for n >= 1, a(n+1) = a(n) + sum of its digits.

Terms

a(0) =3a(1) =6a(2) =12a(3) =15a(4) =21a(5) =24a(6) =30a(7) =33a(8) =39a(9) =51a(10) =57a(11) =69a(12) =84a(13) =96a(14) =111a(15) =114a(16) =120a(17) =123a(18) =129a(19) =141a(20) =147a(21) =159a(22) =174a(23) =186a(24) =201a(25) =204a(26) =210a(27) =213a(28) =219a(29) =231