%I A023269
%S A023269 2,7,17,19,23,37,61,67,73,101,103,173,193,233,359,383,409,479,541,557,
%T A023269 607,613,719,809,857,997,1013,1033,1109,1117,1237,1297,1361,1459,1531,
%U A023269 1549,1699,1823,1871,1979,1999,2069,2131,2161,2347,2377,2399,2447,2663
%N A023269 Numbers n such that n remains prime through 2 iterations of function 
               f(x) = 10x + 3.
%Y A023269 Sequence in context: A129444 A079815 A006883 this_sequence A023300 A045378 
               A101568
%Y A023269 Adjacent sequences: A023266 A023267 A023268 this_sequence A023270 A023271 
               A023272
%K A023269 nonn
%O A023269 1,1
%A A023269 David W. Wilson (davidwwilson(AT)comcast.net)