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 A178369 #8 Apr 26 2014 04:25:08 %S A178369 9,89,98,99,799,889,898,899,979,988,989,997,998,999,6999,7899,7989, %T A178369 7998,7999,8799,8889,8898,8899,8979,8988,8989,8997,8998,8999,9699, %U A178369 9789,9798,9799,9879,9888,9889,9897,9898,9899,9969,9978,9979,9987,9988,9989,9996 %N A178369 Numbers with rounded up arithmetic mean of digits = 9. %C A178369 A004427(a(n)) = 9; %C A178369 A000027 = union of A178361, A178362, A178363, A178364, A178365, A178366, A178367, A178368, and this sequence. %H A178369 Vincenzo Librandi, <a href="/A178369/b178369.txt">Table of n, a(n) for n = 1..2000</a> %t A178369 Select[Range[10000],Ceiling[Mean[IntegerDigits[#]]]==9&] (* _Harvey P. Dale_, Apr 25 2014 *) %K A178369 base,nonn %O A178369 1,1 %A A178369 _Reinhard Zumkeller_, May 27 2010