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%I #6 Sep 08 2022 08:46:01
%S 11,71,311,491,971,2411,3371,3911,7211,12491,15671,16811,19211,28871,
%T 31991,38711,44171,49991,56171,67271,74411,76871,100811,118571,134471,
%U 137771,154871,165611,176711,180491,188171,224711,250871,255371
%N Primes of the form 5n^2 - 9.
%H Vincenzo Librandi, <a href="/A201790/b201790.txt">Table of n, a(n) for n = 1..5000</a>
%t Select[Table[5n^2-9,{n,2,1000}],PrimeQ]
%o (Magma) [a: n in [2..500] | IsPrime(a) where a is 5*n^2-9];
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Dec 05 2011
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