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 A128344 #14 Jul 29 2023 21:48:16
%S A128344 3,5,7,113,397,577,7573,14561,58543,100019,123407,136559,208283,
%T A128344 210761,457871,608347,636043
%N A128344 Numbers k such that (7^k - 5^k)/2 is prime.
%C A128344 All terms are primes.
%C A128344 No other terms less than 10^5. - _Robert Price_, May 28 2012
%C A128344 No other terms less than 10^6. - _Jon Grantham_, Jul 29 2023
%H A128344 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 A128344 k=7; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128344 (PARI) is(n)=isprime((7^n-5^n)/2) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A128344 Cf. A062572, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354. Cf. A004061, A082182, A121877, A059802. Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342.
%K A128344 hard,more,nonn
%O A128344 1,1
%A A128344 _Alexander Adamchuk_, Feb 27 2007
%E A128344 a(7)-a(9) from _Robert Price_, May 28 2012
%E A128344 a(10)-a(17) from _Jon Grantham_, Jul 29 2023