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 A128339 #21 Sep 08 2022 08:45:30
%S A128339 3,5,13,17,43,127,229,277,6043,11131,11821
%N A128339 Numbers k such that (9^k + 5^k)/14 is prime.
%C A128339 All terms are primes.
%C A128339 a(12) > 10^5. - _Robert Price_, Dec 26 2012
%t A128339 k=9; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128339 (PARI) is(n)=isprime((9^n+5^n)/14) \\ _Charles R Greathouse IV_, Feb 17 2017
%o A128339 (Magma) [n: n in [3..300] |IsPrime((9^n + 5^n) div 14)]; // _Vincenzo Librandi_, Nov 02 2018
%Y A128339 Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128340, A128341, A128342, A128343. Cf. A004061, A082182, A121877, A059802. Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
%K A128339 hard,more,nonn
%O A128339 1,1
%A A128339 _Alexander Adamchuk_, Feb 27 2007
%E A128339 3 more PRP terms from _Sean A. Irvine_, Oct 01 2009