%I A118257
%S A118257 2,6,8,10,18,26,30,74,142,203,398,651,792,1314,3487,5978,6240,7814,8054,
%T A118257 8673,21436,23947
%N A118257 Numbers n such that A118255(n) is prime.
%C A118257 A118255(1314) is prime with 396 digits
%C A118257 A118255(23947) is a probable prime with 7209 digits. - from Giovanni 
               Resta (g.resta(AT)iit.cnr.it), Apr 26 2006
%e A118257 A118255(2)=2 prime, A118255(6)=149 prime, A118255(8)=599 prime
%Y A118257 Cf. A005171 A118255 A118256.
%Y A118257 Sequence in context: A036554 A084909 A038619 this_sequence A066762 A066198 
               A108417
%Y A118257 Adjacent sequences: A118254 A118255 A118256 this_sequence A118258 A118259 
               A118260
%K A118257 nonn
%O A118257 1,1
%A A118257 Pierre CAMI (pierrecami(AT)tele2.fr), Apr 19 2006
%E A118257 a(15)-a(22) from Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 26 2006