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 A241678 #14 Sep 08 2022 08:46:07
%S A241678 -1,3,27,123,2043,8187,131067,524283,8388603,536870907,2147483643,
%T A241678 137438953467,2199023255547,8796093022203,140737488355323,
%U A241678 9007199254740987,576460752303423483,2305843009213693947,147573952589676412923,2361183241434822606843
%N A241678 2^p - 5 where p is prime.
%H A241678 Vincenzo Librandi, <a href="/A241678/b241678.txt">Table of n, a(n) for n = 1..200</a>
%t A241678 Table[2^Prime[n] - 5, {n, 40}]
%o A241678 (Magma) [2^p-5: p in PrimesUpTo(100)];
%Y A241678 Cf. similar sequence listed in A241573.
%K A241678 sign
%O A241678 1,2
%A A241678 _Vincenzo Librandi_, Apr 29 2014