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 A217136 #11 Nov 09 2023 11:37:12 %S A217136 1,2,4,5,8,13,14,20,38,44,77,88,124,152,244,557,2429,4382,6268,18488, %T A217136 75097,81998,96460,143497 %N A217136 Numbers k such that 3^k + 8 is prime. %C A217136 a(25) > 2*10^5. - _Robert Price_, Sep 25 2013 %t A217136 Select[Range[0, 5000], PrimeQ[3^# + 8] &] %o A217136 (PARI) for(n=1, 5*10^3, if(isprime(3^n+8), print1(n", "))) %Y A217136 Cf. A014224, A051783, A058958, A058959. %K A217136 nonn %O A217136 1,2 %A A217136 _Vincenzo Librandi_, Oct 01 2012 %E A217136 a(19)-a(24) from _Robert Price_, Sep 25 2013