A201606 - OEIS

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

%S 5,257,1013,2273,30497,36293,90977,183713,197573,326597,383297,423617,

%T 533237,707873,734837,790277,1000193,1097717,1199777,1270337,1306373,

%U 1379957,1951493,1996097,2086817,2371073,2420213,2570657,3217793

%N Primes of the form 7n^2 + 5.

%H Vincenzo Librandi, <a href="/A201606/b201606.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[7n^2+5,{n,0,3000}],PrimeQ]

%o (Magma) [a: n in [0..800] | IsPrime(a) where a is 7*n^2+5];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 03 2011