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 A241680 #11 Sep 08 2022 08:46:07
%S A241680 15,19,43,139,2059,8203,131083,524299,8388619,536870923,2147483659,
%T A241680 137438953483,2199023255563,8796093022219,140737488355339,
%U A241680 9007199254741003,576460752303423499,2305843009213693963,147573952589676412939,2361183241434822606859
%N A241680 2^p + 11 where p is prime.
%H A241680 Vincenzo Librandi, <a href="/A241680/b241680.txt">Table of n, a(n) for n = 1..200</a>
%t A241680 Table[2^Prime[n] + 11, {n, 40}]
%o A241680 (Magma) [2^p+11: p in PrimesUpTo(100)];
%Y A241680 Cf. similar sequence listed in A241573.
%K A241680 nonn
%O A241680 1,1
%A A241680 _Vincenzo Librandi_, Apr 29 2014