%I
%S 2,11,13,17,31,37,41,43,71,73,79,83,97,137,139,151,163,181,191,193,
%T 197,269,277,307,317,347,373,409,431,503,577,743,811,823,911,919,941,
%U 967,983,1021,1033,1049,1051,1093,1163,1187,1201,1361,1373,1423,1493,1571,1597
%N Numbers n such that n remains prime through 2 iterations of function f(x) = 6x + 5.
%C Numbers n such that n, 6*n+5 and 36*n+35 are primes.  _Vincenzo Librandi_, Aug 04 2010
%H John Cerkan, <a href="/A023257/b023257.txt">Table of n, a(n) for n = 1..10000</a>
%o (MAGMA) [n: n in [1..100000]  IsPrime(n) and IsPrime(6*n+5) and IsPrime(36*n+35)] // _Vincenzo Librandi_, Aug 04 2010
%Y Subsequence of A023221.
%K nonn
%O 1,1
%A _David W. Wilson_
