A154831 Numbers n such that n^4-2 is prime.

3, 7, 11, 13, 21, 29, 39, 41, 43, 49, 53, 59, 73, 83, 85, 87, 95, 99, 101, 119, 129, 141, 143, 175, 181, 185, 189, 207, 217, 239, 241, 277, 279, 293, 311, 315, 323, 339, 343, 363, 367, 371, 375, 381, 389, 409, 421, 433, 435, 451, 473, 483, 497, 503, 507, 515

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Jan 15 2009

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A028870, A038599.

Programs

Magma

[n: n in [1..500] | IsPrime(n^4-2)]; // Vincenzo Librandi, Nov 26 2010

Mathematica

lst={};Do[p=n^4-2;If[PrimeQ[p],AppendTo[lst,n]],{n,0,7!}];lst
Select[Range[600],PrimeQ[#^4-2]&] (* Harvey P. Dale, May 20 2012 *)

PARI

is(n)=isprime(n^4-2) \\ Charles R Greathouse IV, Jul 02 2013