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%I #23 Sep 08 2022 08:44:47
%S 71,97,103,263,883,907,1747,1867,2251,2281,2693,2791,2857,3067,3541,
%T 4073,4513,4597,4663,4793,6047,6971,6983,8761,9091,9203,9311,9377,
%U 10343,11131,11437,12037,12107,12401,13451,13627,14887,15881,16217,16301,16493,16871
%N Primes that remain prime through 3 iterations of function f(x) = 4x + 9.
%C Primes p such that 4*p+9, 16*p+45 and 64*p+189 are also primes. - _Vincenzo Librandi_, Aug 04 2010
%H John Cerkan, <a href="/A023282/b023282.txt">Table of n, a(n) for n = 1..10000</a>
%t Select[Prime@ Range@ 2100, Times @@ Boole@ PrimeQ@ Rest@ NestList[4 # + 9 &, #, 3] > 0 &] (* _Michael De Vlieger_, Sep 20 2016 *)
%o (Magma) [n: n in [1..150000] | IsPrime(n) and IsPrime(4*n+9) and IsPrime(16*n+45) and IsPrime(64*n+189)] // _Vincenzo Librandi_, Aug 04 2010
%Y Subsequence of A023216, A023251, and of A111199.
%K nonn
%O 1,1
%A _David W. Wilson_