A217494 Primes of the form 2*n^2 + 34*n + 15.

631, 883, 1171, 2251, 2683, 8191, 9811, 12511, 20071, 25183, 30871, 33931, 38791, 40483, 57331, 61471, 70183, 81883, 94483, 105211, 125371, 150571, 157231, 167491, 188983, 292483, 315883, 340183, 360271, 423991, 440731, 469351, 481051, 510931

Offset: 1

Author

Vincenzo Librandi, Oct 08 2012

Keywords

• nonn
• easy

Comments

Conjecture: 2^a(n)-1 is not prime; in other words, these primes are included in A054723.

2*a(n)+259 is a square. - Vincenzo Librandi, Mar 04 2013

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..3000

Crossrefs

Cf. A054723, A176549.

Subsequence of A002145.

Programs

Magma

[a: n in [1..500] | IsPrime(a) where a is 2*n^2+34*n+15];

Mathematica

Select[Table[2 n^2 + 34 n + 15, {n, 500}], PrimeQ]