A182784 Primes of the form 2*n^4-1.

31, 1249, 2591, 4801, 8191, 13121, 76831, 131071, 388961, 1062881, 1229311, 2672671, 6223391, 7496191, 9759361, 10616831, 12499999, 13530401, 29552671, 31505921, 35701249, 42762751, 48019999, 63281249, 66724351, 77900161, 90424351, 99574271, 149610401

Offset: 1

Author

Vincenzo Librandi, Dec 02 2010

Keywords

• nonn
• easy

Comments

Subsequence of A066436. - R. J. Mathar, Dec 02 2010

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A182783, A182785.

Programs

Magma

[a: n in [1..350] | IsPrime(a) where a is 2*n^4-1];

Mathematica

Select[Table[2 n^4 - 1, {n, 100}], PrimeQ] (* Vincenzo Librandi, Sep 01 2012 *)

Formula

a(n) = 2*A182783(n)^4-1. - R. J. Mathar, Dec 02 2010