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%I #6 Sep 08 2022 08:46:01
%S 251,2267,6299,12347,16127,20411,30491,49391,81647,90971,100799,
%T 121967,170351,183707,197567,211931,226799,242171,344987,363887,
%U 383291,444527,465947,510299,580607,605051,681407,790271,847727,907199
%N Primes of the form 7n^2 - 1.
%H Vincenzo Librandi, <a href="/A201793/b201793.txt">Table of n, a(n) for n = 1..5000</a>
%t Select[Table[7n^2-1,{n,1,1000}],PrimeQ]
%o (Magma) [a: n in [1..400] | IsPrime(a) where a is 7*n^2-1];
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Dec 06 2011
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