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 A107109 #7 May 09 2021 08:12:55
%S A107109 7,89,983,9941,99929,999931,9999929,99999827,999999739,9999999769,
%T A107109 99999999763,999999999697,9999999999443,99999999999503,
%U A107109 999999999999353,9999999999999431,99999999999999251,999999999999999463,9999999999999999343,99999999999999999199
%N A107109 n-th largest n-digit prime.
%C A107109 Cf. A069100: n-th smallest n-digit prime.
%H A107109 Eduard Roure Perdices, <a href="/A107109/b107109.txt">Table of n, a(n) for n = 1..1000</a>
%F A107109 a(n) = prime[pi[10^n]-n+1]
%t A107109 Table[Prime[PrimePi[10^n]-n+1], {n, 13}]
%t A107109 a[n_] := NextPrime[10^n, -n]; (* _Eduard Roure Perdices_, May 09 2021 *)
%Y A107109 Cf. A069100.
%K A107109 nonn,base
%O A107109 1,1
%A A107109 _Zak Seidov_, May 12 2005
%E A107109 Extended by _Eduard Roure Perdices_, May 09 2021