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 A188661 #29 Sep 08 2022 08:45:56
%S A188661 17,41,113,353,1217,4481,67073,1054721,4206593,16801793,274881052673,
%T A188661 18014399314788353,72057595648540673,18446744099479355393,
%U A188661 4722366483281962074113,79228162514266026443404214273
%N A188661 Primes of the form (2^n+3)^2-8.
%C A188661 Primes in A188129.
%H A188661 Vincenzo Librandi, <a href="/A188661/b188661.txt">Table of n, a(n) for n = 1..25</a>
%H A188661 Daniel Shanks, <a href="https://doi.org/10.1090/S0025-5718-1971-0297737-4">Gauss's ternary form reduction and the 2-Sylow subgroup</a>, Math. Comp. 25 (1971), 837-853.
%t A188661 Select[(2^Range[0,50]+3)^2-8,PrimeQ] (* _Harvey P. Dale_, Apr 16 2011 *)
%t A188661 Select[Table[(2^n + 3)^2 - 8, {n, 80}], PrimeQ] (* _Vincenzo Librandi_, Mar 21 2013 *)
%o A188661 (Magma) [a: n in [0..100] | IsPrime(a) where a is (2^n+3)^2-8]; // _Vincenzo Librandi_, Mar 21 2013
%Y A188661 Cf. A188129, A188936.
%K A188661 nonn,easy
%O A188661 1,1
%A A188661 _N. J. A. Sloane_, Apr 14 2011