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 A128335 #18 Jul 10 2022 03:58:11
%S A128335 5,7,19,29,61,137,883,1381,1823,5227,25561,29537,300893
%N A128335 Numbers k such that (4^k + 5^k)/9 is prime.
%C A128335 All terms are primes.
%H A128335 Henri Lifchitz and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=%285%5Ep%2B4%5Ep%29%2F9">Top probable primes of the form (5^p+4^p)/9</a>
%t A128335 k=4; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128335 (PARI) forprime(p=3,1e4,if(ispseudoprime((5^p+4^p)/9),print1(p", "))) \\ _Charles R Greathouse IV_, Jul 16 2011
%K A128335 hard,more,nonn
%O A128335 1,1
%A A128335 _Alexander Adamchuk_, Feb 27 2007
%E A128335 3 more terms from _Ryan Propper_, Feb 06 2008
%E A128335 Two more terms from _Ryan Propper_, May 02 2010
%E A128335 New term 300893 found by Jean-Louis Charton in November 2011 corresponding to a probable prime with 210315 digits.