Smallest multiple of n with digit sum = 6, or 0 if no such number exists, e.g. a(9k)= 0.

Terms

a(0) =6a(1) =6a(2) =6a(3) =24a(4) =15a(5) =6a(6) =42a(7) =24a(8) =0a(9) =60a(10) =33a(11) =24a(12) =312a(13) =42a(14) =15a(15) =240a(16) =51a(17) =0a(18) =114a(19) =60a(20) =42a(21) =132a(22) =1104a(23) =24a(24) =150a(25) =312a(26) =0a(27) =420a(28) =1131a(29) =60