|
%I #21 Sep 08 2022 08:46:04
%S 631,883,1171,2251,2683,8191,9811,12511,20071,25183,30871,33931,38791,
%T 40483,57331,61471,70183,81883,94483,105211,125371,150571,157231,
%U 167491,188983,292483,315883,340183,360271,423991,440731,469351,481051,510931
%N Primes of the form 2*n^2 + 34*n + 15.
%C Conjecture: 2^a(n)-1 is not prime; in other words, these primes are included in A054723.
%C 2*a(n)+259 is a square. - _Vincenzo Librandi_, Mar 04 2013
%H Vincenzo Librandi, <a href="/A217494/b217494.txt">Table of n, a(n) for n = 1..3000</a>
%t Select[Table[2 n^2 + 34 n + 15, {n, 500}], PrimeQ]
%o (Magma) [a: n in [1..500] | IsPrime(a) where a is 2*n^2+34*n+15];
%Y Cf. A054723, A176549.
%Y Subsequence of A002145.
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Oct 08 2012
|
