A182783 Numbers k such that 2*k^4 - 1 is a prime.

2, 5, 6, 7, 8, 9, 14, 16, 21, 27, 28, 34, 42, 44, 47, 48, 50, 51, 62, 63, 65, 68, 70, 75, 76, 79, 82, 84, 93, 96, 98, 103, 106, 114, 120, 121, 124, 131, 133, 138, 139, 147, 148, 149, 156, 166, 169, 173, 174, 182, 195, 197, 201, 203, 216, 218, 225, 229, 237, 240, 243, 247, 253, 275, 282, 292, 299, 300, 307, 309, 310

Offset

1,1

Links

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

Mathematica

Select[Range[350], PrimeQ[2#^4-1]&] (* Harvey P. Dale, Sep 12 2011 *)

Prog

(Magma) [n: n in [1..1000]| IsPrime(2*n^4-1)]

Crossrefs

Cf. A182784, A182785.

Sequence in context: A047326 A039044 A212441 * A084852 A288659 A228374

Adjacent sequences: A182780 A182781 A182782 * A182784 A182785 A182786

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 02 2010

Status

approved