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 A201713 #6 Sep 08 2022 08:46:01
%S A201713 3,13,67,157,283,643,877,1453,3037,4603,5197,5827,7933,8707,12163,
%T A201713 14107,17293,18427,19597,30253,34843,38083,41467,56443,58477,62653,
%U A201713 66973,71437,83227,93307,95917,98563,103963,109507,118093,123997
%N A201713 Primes of the form 2n^2 - 5.
%H A201713 Vincenzo Librandi, <a href="/A201713/b201713.txt">Table of n, a(n) for n = 1..5000</a>
%t A201713 Select[Table[2n^2-5,{n,2,1000}],PrimeQ]
%o A201713 (Magma) [a: n in [2..300] | IsPrime(a) where a is 2*n^2-5];
%K A201713 nonn,easy
%O A201713 1,1
%A A201713 _Vincenzo Librandi_, Dec 04 2011