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 A109936 #5 Dec 05 2013 19:57:01
%S A109936 8,9,10,98,99,100,998,999,1000,1001,1002,1003,1004,1005,1006,1007,
%T A109936 1008,9974,9975,9976,9977,9978,9979,9980,9981,9982,9983,9984,9985,
%U A109936 9986,9987,9988,9989,9990,9991,9992,9993,9994,9995,9996,9997,9998,9999,10000
%N A109936 Composite numbers between largest n-digit prime and the smallest (n+1) digit prime.
%t A109936 Flatten[Table[Range[NextPrime[10^n,-1]+1,NextPrime[10^n]-1],{n,5}]] (* _Harvey P. Dale_, Nov 03 2011 *)
%K A109936 base,easy,nonn
%O A109936 1,1
%A A109936 _Amarnath Murthy_, Jul 19 2005