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 A289716 #31 Jun 17 2025 00:37:20
%S A289716 11,227,177131,14348891,2153693963075557766310731,
%T A289716 834385168331080533771857328695267,
%U A289716 171792506910670443678820376588540424234035840651,2025465365549235636389379590279612045176776005882811610332067323733925450296747107485272801773488928849912971
%N A289716 Primes of the form 3^k - 16.
%H A289716 Robert Price, <a href="/A289716/b289716.txt">Table of n, a(n) for n = 1..9</a>
%H A289716 F. Firoozbakht and M. F. Hasler, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Hasler/hasler2.html">Variations on Euclid's formula for Perfect Numbers</a>, JIS 13 (2010) #10.3.1.
%H A289716 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A289716 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%F A289716 a(n) = 3^A219039(n) - 16. - _Elmo R. Oliveira_, Nov 12 2023
%t A289716 Select[Table[3^k - 16, {k, 3, 100}], PrimeQ[#] &]
%Y A289716 Cf. A000040, A219039 (corresponding k's).
%K A289716 nonn
%O A289716 1,1
%A A289716 _Robert Price_, Sep 02 2017