A174819 Primes of form n^4 + n^2 - 1.

19, 89, 271, 4159, 10099, 20879, 28729, 38611, 50849, 130681, 391249, 457651, 1049599, 1187009, 1501849, 1875529, 3113459, 3420649, 3750031, 4102649, 6767801, 7893289, 9837631, 10559249, 11319859, 14780179, 17854849, 21385999, 31646249

Offset: 1

Author

Michel Lagneau, Dec 01 2010

Keywords

• nonn

Comments

Primes of the form A071253(n) - 1. - Altug Alkan, Mar 24 2017

Examples

			a(2) = 89 is in the sequence because 3^4 + 3^2 - 1 = 89 is prime.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A071253.

Programs

Maple

select(isprime, [seq(n^4+n^2-1, n=1..1000)]); # Robert Israel, Mar 24 2017

Mathematica

a={}; Do[p=n^4+n^2-1; If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; Print[a];

PARI

for(n=1, 1e3, if(isprime(p=n^4+n^2-1), print1(p ", "))) \\ Altug Alkan, Mar 24 2017