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Primes of the form 5n^2 + 3.
1

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

%S 3,23,83,503,983,1283,2003,2423,3923,5783,12503,13523,15683,16823,

%T 20483,32003,33623,38723,42323,48023,54083,62723,69623,76883,84503,

%U 89783,100823,115523,118583,124823,154883,169283,180503,200003

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

%H Vincenzo Librandi, <a href="/A201482/b201482.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[5n^2+3,{n,0,900}],PrimeQ]

%o (Magma) [a: n in [0..400] | IsPrime(a) where a is 5*n^2+3];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 02 2011