a(n) = the smallest number k such that the base-10 digital sum of sigma(k) is n.

Terms

a(0) =1a(1) =19a(2) =2a(3) =3a(4) =13a(5) =5a(6) =4a(7) =7a(8) =10a(9) =12a(10) =28a(11) =18a(12) =192a(13) =67a(14) =42a(15) =273a(16) =52a(17) =138a(18) =324a(19) =336a(20) =196a(21) =300a(22) =372a(23) =438a(24) =2716a(25) =997a(26) =1590a(27) =3468a(28) =2512a(29) =3260