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 A274711 #7 Jul 04 2016 03:47:08 %S A274711 0,2,6,34,282,3662,87206 %N A274711 Numbers n such that 5^n + 4^(n+1) is prime. %C A274711 a(8) > 10^5. %e A274711 6 is a member since 5^6 + 4^7 = 15625 + 16384 = 32009 which is a prime number. %t A274711 Select[Range[0, 100000], PrimeQ[5^# + 4^(# + 1)] &] %o A274711 (PARI) lista(nn) = for(n=0, nn, if(ispseudoprime(5^n + 4^(n+1)), print1(n, ", "))); \\ _Altug Alkan_, Jul 03 2016 %Y A274711 Cf. A093713, A082103, A093717, A093793, A096185, A093794, A093795, A096186, A271883, A271884. %K A274711 nonn,more %O A274711 1,2 %A A274711 _Robert Price_, Jul 03 2016