Numbers n with k digits such that each sum of 1, 2, ..., k digits of n is a substring of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =20a(12) =30a(13) =40a(14) =50a(15) =60a(16) =70a(17) =80a(18) =90a(19) =100a(20) =109a(21) =200a(22) =300a(23) =400a(24) =500a(25) =600a(26) =700a(27) =800a(28) =910a(29) =1000