%I A088110
%S A088110 0,1,3,9
%N A088110 Numbers n such that 2^n + n as well as 2^n - n are noncomposite.
%C A088110 Conjecture: sequence is finite.
%C A088110 No more terms < 88075. - David Wasserman (wasserma(AT)spawar.navy.mil), 
               Jul 20 2005
%e A088110 9 is a member as 2^9 + 9 = 521 as well as 2^9-9 = 503 are primes.
%Y A088110 Cf. A052007, A048744.
%Y A088110 Sequence in context: A162185 A063103 A058847 this_sequence A122759 A016626 
               A126321
%Y A088110 Adjacent sequences: A088107 A088108 A088109 this_sequence A088111 A088112 
               A088113
%K A088110 more,nonn
%O A088110 1,3
%A A088110 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 25 2003