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 A243437 #14 Nov 11 2023 13:54:58
%S A243437 17,19,43,97,2203,6577,19699,531457,1594339,14348923,7625597485003,
%T A243437 617673396283963,239299329230617529590099,
%U A243437 1570042899082081611640534579,42391158275216203514294433217,608266787713357709119683992618861323
%N A243437 Primes of the form 3^k + 16.
%C A243437 Associated n: 0, 1, 3, 4, 7, 8, 9, 12, 13, 15, 27, 31, 49, 57, 60, 75, 139, 147, ...
%H A243437 Vincenzo Librandi, <a href="/A243437/b243437.txt">Table of n, a(n) for n = 1..28</a>
%F A243437 a(n) = 3^A205647(n) + 16. - _Elmo R. Oliveira_, Nov 11 2023
%t A243437 Select[Table[3^n + 16, {n, 0, 500}], PrimeQ]
%o A243437 (Magma) [a: n in [0..200] | IsPrime(a) where a is 3^n+16];
%Y A243437 Cf. A000040, A205647 (corresponding k's).
%Y A243437 Cf. Similar sequences listed in A102903.
%K A243437 nonn
%O A243437 1,1
%A A243437 _Vincenzo Librandi_, Jun 05 2014