A201858 - OEIS

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

%S 193,281,641,4993,7193,7681,9241,12161,13441,16193,16921,19993,23321,

%T 28793,29761,34841,43801,49921,51193,57793,63361,64793,73721,78401,

%U 98561,107641,123001,133121,135193,168193,177601,192193,194681

%N Primes of the form 8n^2 - 7.

%H Vincenzo Librandi, <a href="/A201858/b201858.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[8n^2-7,{n,1,300}],PrimeQ]

%o (Magma) [a: n in [1..400] | IsPrime(a) where a is 8*n^2-7];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 06 2011