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 A274693 #11 Sep 08 2022 08:46:17 %S A274693 1,2,4,5,9,10,12,17,18,29,30,40,58,82,113,129,164,192,252,524,624,766, %T A274693 977,1742,2208,2440,3052,4742,5480,16572,17501 %N A274693 Numbers n such that 4^n + 3^(n+1) is prime. %C A274693 a(32) > 10^5. %e A274693 5 is a member since 4^5 + 3^6 = 1024 + 729 = 1753 which is a prime number. %t A274693 Select[Range[0, 100000], PrimeQ[4^# + 3^(# + 1)] &] %o A274693 (PARI) lista(nn) = for(n=1, nn, if(ispseudoprime(4^n + 3^(n+1)), print1(n, ", "))); \\ _Altug Alkan_, Jul 02 2016 %o A274693 (Magma) [n: n in [1..700] | IsPrime(4^n + 3^(n+1))]; // _Vincenzo Librandi_, Jul 03 2016 %Y A274693 Cf. A093713, A082103, A093717, A093793, A096185, A093794, A093795, A096186, A271883. %K A274693 nonn,more %O A274693 1,2 %A A274693 _Robert Price_, Jul 02 2016