Composite numbers n with k digits such that each sum of 1 to k digits of n is substring of n.

Terms

a(0) =4a(1) =6a(2) =8a(3) =9a(4) =10a(5) =20a(6) =30a(7) =40a(8) =50a(9) =60a(10) =70a(11) =80a(12) =90a(13) =100a(14) =200a(15) =300a(16) =400a(17) =500a(18) =600a(19) =700a(20) =800a(21) =910a(22) =1000a(23) =1090a(24) =2000a(25) =3000a(26) =4000a(27) =5000a(28) =6000a(29) =7000