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 A135563 #8 Apr 16 2025 10:58:39
%S A135563 11,101,1481,13001,101111,1002341,10013951,100005461,1000025261,
%T A135563 10000057421,100000007531,1000000123691,10000000056581,
%U A135563 100000000945721,1000000000067441,10000000001346491,100000000000325231
%N A135563 First member of smallest n-digit prime quadruplet.
%e A135563 a(5) = 13001 because the smallest 5-digit prime quadruplet is {13001, 13003, 13007, 13009}
%t A135563 s={};Do[m=10^(n-1)+1;While[!AllTrue[{m,m+2,m+6,m+8},PrimeQ],m=m+10];AppendTo[s,m],{n,2,18}];s (* _James C. McMahon_, Apr 16 2025 *)
%Y A135563 Cf. A120120.
%K A135563 base,nonn,more
%O A135563 2,1
%A A135563 Julien Peter Benney (jpbenney(AT)gmail.com), Feb 23 2008
%E A135563 a(9)-a(18) from _Donovan Johnson_, May 23 2010