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%I #20 Sep 08 2022 08:44:47
%S 13,19,31,79,97,199,331,349,373,457,541,577,607,643,709,769,811,859,
%T 1021,1069,1171,1249,1321,1381,1447,1483,1693,1867,2113,2137,2239,
%U 2539,2719,3037,3061,3163,3181,3187,3313,3433,3463,3673,3727,3853,3919,4021,4639
%N Primes that remain prime through 2 iterations of function f(x) = 5x + 2.
%C Primes p such that 5*p+2 and 25*p+12 are also primes. - _Vincenzo Librandi_, Aug 04 2010
%H Harvey P. Dale, <a href="/A023252/b023252.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[1000]],And@@PrimeQ[NestList[5#+2&,#,2]]&] (* _Harvey P. Dale_, Nov 24 2012 *)
%o (Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(5*n+2) and IsPrime(25*n+12)] // _Vincenzo Librandi_, Aug 04 2010
%K nonn
%O 1,1
%A _David W. Wilson_
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