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%I A174367 #8 Sep 08 2022 08:45:51
%S A174367 2,197,499,587,601,1237,2111,2153,2861,3253,3301,3923,4373,5101,5387,
%T A174367 5437,6529,6563,7459,9817,9833,10477,11047,11699,12101,12823,12907,
%U A174367 13859,14087,15569,21401,21929,22727,23473,23687,23893,25633,26393
%N A174367 Primes p such that 2*p^4-+21 are also prime.
%H A174367 Vincenzo Librandi, <a href="/A174367/b174367.txt">Table of n, a(n) for n = 1..1000</a>
%e A174367 For p=2, 2*2^4-+21=(11,53); p=197, 2*197^4-+21=(3012276941,3012276983)
%t A174367 Select[Prime[Range[1000]], And@@PrimeQ[2 #^4 + {21, -21}]&] (* _Vincenzo Librandi_, Apr 10 2013 *)
%o A174367 (Magma) [p: p in PrimesUpTo(100000)|IsPrime(2*p^4-21) and IsPrime(2*p^4+21)];
%K A174367 nonn,easy
%O A174367 1,1
%A A174367 _Vincenzo Librandi_, Mar 17 2010

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