A173929 Primes in A173299.

2, 5, 7, 19, 13, 71, 97, 181, 3691, 2521, 191861, 489061, 6811741, 138907099, 708158977, 1321442641, 26947261171, 18405321661, 381765135195632792959100810331957408101589361

Offset: 1

Author

Klaus Brockhaus, Mar 02 2010

Keywords

• nonn

Comments

a(20) has 84 digits. Most terms of A173299 are nonprime.

Crossrefs

Cf. A173299.

Programs

Magma

Z:=PolynomialRing(Integers()); N:=NumberField(2*x^2-2*x-1); S:=[ r^n+(1-r)^n: n in [1..300] ]; [ k: j in [1..#S] | IsPrime(k) where k is Numerator(RationalField()!S[j])];