a(n) is the least number that has exactly n divisors with sum of digits n.

Terms

a(0) =1a(1) =20a(2) =60a(3) =440a(4) =1400a(5) =420a(6) =11200a(7) =11440a(8) =324a(9) =58520a(10) =180880a(11) =18480a(12) =585200a(13) =523600a(14) =114240a(15) =1133440a(16) =2420600a(17) =17820a(18) =9634240a(19) =9529520a(20) =1659840a(21) =33353320a(22) =71380400a(23) =4748100a(24) =178890320a(25) =228388160a(26) =671328a(27) =413736400a(28) =1081662400a(29) =73670520