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 A228225 #8 Jun 13 2017 10:32:29
%S A228225 37,641,2521,7993,41213
%N A228225 Numbers n such that (17^n + 3^n)/20 is prime.
%C A228225 All terms are primes.
%C A228225 a(6) > 10^5.
%t A228225 k=17; Do[ p=Prime[n]; f=(3^p+k^p)/(k+3); If[ PrimeQ[f], Print[p]], {n, 1, 9592} ]
%o A228225 (PARI) is(n)=ispseudoprime((17^n+3^n)/20) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A228225 Cf. A128073, A224507, A128075, A227046.
%K A228225 hard,more,nonn
%O A228225 1,1
%A A228225 _Robert Price_, Aug 16 2013