This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A205530 #7 Mar 30 2012 19:00:28 %S A205530 4,6,8,9,10,20,30,40,50,60,70,80,90,100,200,300,400,500,600,700,800, %T A205530 910,1000,1090,2000,3000,4000,5000,6000,7000,8000,9000,9010,9100, %U A205530 10000,10090,10900,20000,30000,40000,50000,60000,70000,80000,90000,90010,90100,91000 %N A205530 Composite numbers n with k digits such that each sum of 1 to k digits of n is substring of n. %C A205530 Complement of A205529 with respect to A202272. %e A205530 910 is in sequence because all possible sums of digits 0, 1, 1, 9, 9, 10, 10 are substrings of 910. %Y A205530 Cf. A205529, A202272. %K A205530 nonn,base %O A205530 1,1 %A A205530 _Jaroslav Krizek_, Jan 28 2012