Numbers whose sum of digits is 4.

Terms

a(0) =4a(1) =13a(2) =22a(3) =31a(4) =40a(5) =103a(6) =112a(7) =121a(8) =130a(9) =202a(10) =211a(11) =220a(12) =301a(13) =310a(14) =400a(15) =1003a(16) =1012a(17) =1021a(18) =1030a(19) =1102a(20) =1111a(21) =1120a(22) =1201a(23) =1210a(24) =1300a(25) =2002a(26) =2011a(27) =2020a(28) =2101a(29) =2110