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 A217133 #20 Apr 24 2022 06:35:26 %S A217133 1,95,335,3155,28651,91135 %N A217133 Numbers n such that 5^n + 8 is prime. %C A217133 Naturally these numbers are odd since (6-1)^(2n)+8 is divisible by 3. - _Bruno Berselli_, Oct 04 2012 %C A217133 a(7) > 10^5. - _Robert Price_, Feb 03 2014 %C A217133 a(7) > 5*10^5. - _Tyler NeSmith_, Apr 24 2022 %t A217133 Select[Range[1, 15000, 2], PrimeQ[5^# + 8] &] %o A217133 (PARI) for(n=1, 5*10^3, if(isprime(5^n+8), print1(n", "))) %Y A217133 Cf. A087885, A089142, A124621. %K A217133 nonn,more %O A217133 1,2 %A A217133 _Vincenzo Librandi_, Oct 01 2012 %E A217133 a(5)-a(6) from _Robert Price_, Feb 03 2014