%I A117705
%S A117705 2,14,26,4646,68484
%N A117705 Numbers n such that 5^n-n^5 is prime.
%C A117705 a(5) found by Donovan Johnson
%H A117705 Donovan Johnson, <a href="http://www.primenumbers.net/prptop/detailprp.php?rank=259">
               a(5)</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}]
%Y A117705 Sequence in context: A109080 A032461 A072390 this_sequence A031079 A157023 
               A101554
%Y A117705 Adjacent sequences: A117702 A117703 A117704 this_sequence A117706 A117707 
               A117708
%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 First five terms confirmed by Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), 
               Dec 18 2008