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 A123083 #7 Sep 17 2023 11:18:08
%S A123083 5,11,17,23,11,17,23,29,41,47,53,59,61,67,73,79,251,257,263,269,601,
%T A123083 607,613,619,641,647,653,659,1091,1097,1103,1109,1481,1487,1493,1499,
%U A123083 1601,1607,1613,1619,1741,1747,1753,1759,1861,1867,1873,1879,2371,2377,2383
%N A123083 Prime quartets of form k, k+6, k+12, k+18.
%H A123083 Harvey P. Dale, <a href="/A123083/b123083.txt">Table of n, a(n) for n = 1..1000</a>
%p A123083 i:=1:for k from 1 to 5000 do if isprime(k) and isprime(k+6)and isprime(k+12)and isprime(k+18) then a[i]:=k:a[i+1]:=k+6:a[i+2]:=k+12:a[i+3]:=k+18:i:=i+4 fi od: seq(a[n],n=1..i-1);
%t A123083 Select[Table[p+{0,6,12,18},{p,Prime[Range[400]]}],AllTrue[#,PrimeQ]&]//Flatten (* _Harvey P. Dale_, Sep 17 2023 *)
%Y A123083 Cf. A001097.
%K A123083 nonn
%O A123083 1,1
%A A123083 _Miklos Kristof_, Sep 27 2006