A201476 - OEIS

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

%S 11,17,41,59,107,137,251,347,401,521,587,809,977,1259,1361,1931,2459,

%T 2897,3209,3371,3881,4241,5009,5417,6737,6971,7451,9257,10091,10667,

%U 11867,12491,12809,13457,15497,16937,17681,18059,20411,21227

%N Primes of the form 2n^2 + 9.

%H Vincenzo Librandi, <a href="/A201476/b201476.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[2n^2+9,{n,0,700}],PrimeQ]

%o (Magma) [a: n in [0..400] | IsPrime(a) where a is 2*n^2+9];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 02 2011