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%I #15 Sep 08 2022 08:45:56
%S 3,12,15,18,21,33,36,48,51,66,78,81,93,102,114,120,132,150,153,162,
%T 180,183,213,225,228,231,234,237,243,246,252,279,282,285,294,303,318,
%U 324,333,375,378,381,384,393,396,399,417,432,450,459,468,480,489,495,510
%N Numbers n such that 8*n^2+1 is a prime.
%C Half of the even terms of A089001. - R. J. Mathar, Apr 09 2011
%H Vincenzo Librandi, <a href="/A188549/b188549.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[600],PrimeQ[8#^2+1]&] (* _Harvey P. Dale_, Apr 11 2012 *)
%o (Magma) [n: n in [1..1800]|IsPrime(8*n^2 + 1)]; - Vincenzo Librandi, 04 2011
%Y Cf. A090685 (Primes of the form 8*n^2 + 1), A089001.
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Apr 04 2011
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