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 A014181 #19 Jul 08 2025 02:54:39
%S A014181 11,22,33,44,55,66,77,88,99,111,222,333,444,555,666,777,888,999,1111,
%T A014181 2222,3333,4444,5555,6666,7777,8888,9999,11111,22222,33333,44444,
%U A014181 55555,66666,77777,88888,99999,111111,222222,333333,444444,555555,666666,777777,888888
%N A014181 Numbers > 9 with all digits the same.
%C A014181 Original definition: Numbers in which all digits are repeated. (This would also include all terms of A033023 (e.g., 1100, 1122, ...) and maybe also 1010, 1212, etc.) - _M. F. Hasler_, Jun 24 2016
%H A014181 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, -10).
%t A014181 Table[Map[FromDigits@ Table[#, k] &, Range@ 9], {k, 2, 6}] // Flatten (* _Michael De Vlieger_, Jun 24 2016 *)
%o A014181 (PARI) A014181(n)=10^((n+17)\9)\9*((n-1)%9+1) \\ See A010785 for a nxt() function. - _M. F. Hasler_, Jun 24 2016
%Y A014181 Same as A010785 except for one-digit numbers.
%K A014181 nonn,base
%O A014181 1,1
%A A014181 _N. J. A. Sloane_
%E A014181 Better definition and offset changed to 1 by _M. F. Hasler_, Jun 24 2016