%I A056206
%S A056206 3,3,3,3,5,3,3,7,11,7,5,3,17,37,3,3,29,3,53,7,17,67,11,43,41,97,29,3,
%T A056206 11,3,11,61,17,79,53,31,29,7,23,97,71,277,29,7,59,127,5,61,191,193,101,
%U A056206 37,5,163,3,97,131,577,131,151,197,193,29,13,131,709,3,61,29,67,11,331
%N A056206 Smallest prime p such that p+2^n is also a prime.
%F A056206 a(n)=Min{p|p+2^n=q, both p and q are primes}
%e A056206 n=9, 512+{2,3,5,7,11,...}={514,515,519,523,...}={2.257,5.103,11.47,3.173,
               523=prime,...}. The smallest suitable prime is 11 and it gives 523=512+11. 
               So a(9)=11.
%Y A056206 Cf. A056208.
%Y A056206 Sequence in context: A006671 A046074 A068048 this_sequence A125713 A162220 
               A118911
%Y A056206 Adjacent sequences: A056203 A056204 A056205 this_sequence A056207 A056208 
               A056209
%K A056206 nonn
%O A056206 0,1
%A A056206 Labos E. (labos(AT)ana.sote.hu), Oct 06 2000