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 A213073 #10 Jul 29 2023 21:25:17
%S A213073 2,5,11,61,619,2879,2957,24371,69247,376463,571199,624803
%N A213073 Numbers n such that (7^n - 4^n)/3 is prime.
%C A213073 All terms are primes.
%C A213073 Next term > 10^6.
%H A213073 Jon Grantham and Andrew Granville, <a href="https://arxiv.org/abs/2307.07894">Fibonacci primes, primes of the form 2^n-k and beyond</a>, arXiv:2307.07894 [math.NT], 2023.
%t A213073 k=7; Do[p=Prime[n]; f=(k^p-4^p)/(k-4); If[ PrimeQ[f], Print[p] ], {n, 1, 100}]
%o A213073 (PARI) is(n)=ispseudoprime((7^n-4^n)/3) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A213073 Cf. A128344, A128024, A059802.
%K A213073 hard,more,nonn
%O A213073 1,1
%A A213073 _Robert Price_, Jun 04 2012
%E A213073 a(10)-a(12) from _Jon Grantham_, Jul 29 2023