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 A227046 #12 Jul 30 2025 23:33:09
%S A227046 3,29,151,2153,5717,9133,9973,79537
%N A227046 Numbers k such that (17^k + 5^k)/22 is prime.
%C A227046 All terms are primes.
%C A227046 a(9) > 10^5.
%t A227046 k=17; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n, 1, 9592}]
%o A227046 (PARI) is(n)=ispseudoprime((17^n+5^n)/22) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A227046 Cf. A128340, A128341, A128342, A128343, A057183.
%K A227046 hard,more,nonn
%O A227046 1,1
%A A227046 _Robert Price_, Jun 29 2013