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 A117705 #13 Feb 17 2017 14:25:52
%S A117705 2,14,26,4646,68484
%N A117705 Numbers n such that 5^n-n^5 is prime.
%H A117705 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=5%5En-n%5E5">PRP Records.</a>
%e A117705 a(1)=2 because 2^5 - 5^2 = 7 is prime
%t A117705 Do[If[PrimeQ[(5^n-n^5)],Print[n]],{n,1,5000}]
%o A117705 (PARI) is(n)=isprime(5^n-n^5) \\ _Charles R Greathouse IV_, Feb 17 2017
%K A117705 hard,more,nonn
%O A117705 1,1
%A A117705 Mohammed Bouayoun (Mohammed.Bouayoun(AT)sanef.com), Apr 13 2006, Jan 08 2008
%E A117705 a(5) found by _Donovan Johnson_
%E A117705 First five terms confirmed by _Dmitry Kamenetsky_, Dec 18 2008