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 A128346 #26 Aug 08 2023 12:21:12
%S A128346 3,11,17,173,839,971,40867,45821,147503
%N A128346 Numbers k such that (9^k - 5^k)/4 is prime.
%C A128346 All terms are primes.
%C A128346 a(9) > 10^5. - _Robert Price_, Jan 19 2013
%C A128346 a(10) > 10^6. - _Jon Grantham_, Jul 29 2023
%H A128346 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 A128346 k=9; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128346 (PARI) is(n)=isprime((9^n-5^n)/4) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A128346 Cf. A062572, A128344, A128345, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
%Y A128346 Cf. A004061, A082182, A121877, A059802.
%Y A128346 Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342.
%K A128346 hard,more,nonn
%O A128346 1,1
%A A128346 _Alexander Adamchuk_, Feb 27 2007
%E A128346 a(7)-a(8) from _Robert Price_, Jan 19 2013
%E A128346 a(8) corrected by _Robert Price_, Jan 20 2013
%E A128346 a(9) from _Jon Grantham_, Jul 29 2023