a(n) = smallest k such that 4k has a digit sum = n.

Terms

a(0) =25a(1) =5a(2) =3a(3) =1a(4) =8a(5) =6a(6) =4a(7) =2a(8) =9a(9) =7a(10) =14a(11) =12a(12) =19a(13) =17a(14) =24a(15) =22a(16) =47a(17) =72a(18) =97a(19) =122a(20) =147a(21) =172a(22) =197a(23) =222a(24) =247a(25) =497a(26) =747a(27) =997a(28) =1247a(29) =1497