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 A091801 #9 Jun 06 2023 14:05:56
%S A091801 8,99,995,9996,99990,999999,9999995,99999983,999999980,9999999994,
%T A091801 99999999981,999999999999,9999999999984,99999999999964,
%U A091801 999999999999960,9999999999999954,99999999999999992,999999999999999959
%N A091801 Largest n-digit multiple of the n-th prime.
%H A091801 Harvey P. Dale, <a href="/A091801/b091801.txt">Table of n, a(n) for n = 1..1000</a>
%t A091801 Table[Prime[n] Floor[(10^n-1)/Prime[n]],{n,20}] (* _Harvey P. Dale_, Jun 06 2023 *)
%Y A091801 Cf. A091802, A091803, A091804.
%K A091801 base,nonn
%O A091801 1,1
%A A091801 _Amarnath Murthy_, Feb 21 2004
%E A091801 More terms from _Ray Chandler_, Feb 22 2004