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 A093717 #13 Feb 17 2017 11:58:53 %S A093717 1,2,3,4,6,8,10,12,15,19,27,30,32,34,43,48,51,72,88,106,906,963,1328, %T A093717 1336,1611,1664,2680,3122,3267,5323,6499,7870,32836,37846,38456,41912, %U A093717 45238,51991,63530,68704 %N A093717 Numbers n such that 4^n+3^(n-1) is prime. %C A093717 a(41) > 10^5. - _Robert Price_, Apr 11 2016 %e A093717 19 is a member since 4^19 + 3^18 = 2388583837526729, which is a prime number. %t A093717 Select[Range[1000], PrimeQ[4^# + 3^(# - 1)] &] %o A093717 (PARI) is(n)=isprime(4^n+3^(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A093717 Cf. A082103, A093793, A093765, A096185, A093794, A093795, A096186. %K A093717 nonn %O A093717 1,2 %A A093717 Herman H. Rosenfeld (herm3(AT)pacbell.net), May 17 2004 %E A093717 More terms from _Robert G. Wilson v_, Jun 18 2004 %E A093717 a(30)-a(40) from _Robert Price_, Apr 11 2016