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Primes of the form 5n^2 - 2.
1

%I #6 Sep 08 2022 08:46:01

%S 3,43,1123,2203,3643,5443,7603,13003,19843,28123,32803,49003,61603,

%T 68443,83203,117043,146203,167443,178603,214243,226843,239803,280843,

%U 356443,406123,423403,441043,496123,595123,616003,637243,680803

%N Primes of the form 5n^2 - 2.

%H Vincenzo Librandi, <a href="/A201784/b201784.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[5n^2-2,{n,1,2000}],PrimeQ]

%o (Magma) [a: n in [1..400] | IsPrime(a) where a is 5*n^2-2];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 05 2011