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%I #16 Sep 08 2022 08:45:17
%S 2,7,11,17,41,61,101,167,227,257,281,337,347,367,397,401,461,467,487,
%T 541,571,587,601,631,641,647,661,691,701,761,857,947,971,977,997,1021,
%U 1087,1237,1277,1291,1381,1451,1481,1607,1621,1627,1667,1697,1787,1811
%N Primes p such that 8*p^2 + 4*p + 1 is also prime.
%H Vincenzo Librandi, <a href="/A103776/b103776.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[300]], PrimeQ[8 #^2 + 4 # + 1]&] (* _Harvey P. Dale_, Jan 04 2011 *)
%o (Magma) [n: n in [0..2000] | IsPrime(n) and IsPrime(8*n^2 + 4*n + 1)]; // _Vincenzo Librandi_, Feb 03 2014
%Y Cf. A102083.
%K nonn,easy
%O 1,1
%A _Zak Seidov_, Feb 15 2005
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