login
Primes of the form 5n^2 - 3.
1

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

%S 2,17,317,977,1277,1997,2417,3917,9677,12497,20477,23117,33617,48017,

%T 60497,109517,127997,137777,144497,154877,165617,180497,216317,224717,

%U 269117,353777,369917,499277,511997,518417,612497,662477,721997

%N Primes of the form 5n^2 - 3.

%H Vincenzo Librandi, <a href="/A201785/b201785.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[5n^2-3,{n,1,2000}],PrimeQ]

%o (Magma) [a: n in [1..400] | IsPrime(a) where a is 5*n^2-3];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 05 2011