%I A023268
%S A023268 11,13,43,47,67,83,89,103,109,193,197,251,281,293,383,397,449,461,601,
%T A023268 617,641,733,757,823,839,853,887,937,967,1013,1069,1091,1447,1489,1733,
%U A023268 1741,1789,1931,2111,2237,2239,2251,2339,2521,2539,2647,2671,2693,2797
%N A023268 Numbers n such that n remains prime through 2 iterations of function 
               f(x) = 9x + 10.
%Y A023268 Sequence in context: A132241 A045467 A108264 this_sequence A154292 A027450 
               A036295
%Y A023268 Adjacent sequences: A023265 A023266 A023267 this_sequence A023269 A023270 
               A023271
%K A023268 nonn
%O A023268 1,1
%A A023268 David W. Wilson (davidwwilson(AT)comcast.net)