Smallest multiple of n with digit sum = 4, or 0 if no such number exists, e.g. a(3k)= 0.

Terms

a(0) =4a(1) =4a(2) =0a(3) =4a(4) =40a(5) =0a(6) =112a(7) =40a(8) =0a(9) =40a(10) =22a(11) =0a(12) =13a(13) =112a(14) =0a(15) =112a(16) =1003a(17) =0a(18) =1102a(19) =40a(20) =0a(21) =22a(22) =1012a(23) =0a(24) =400a(25) =130a(26) =0a(27) =112a(28) =1102a(29) =0