A173929 Primes in A173299.

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..19.

Prog

(Magma) Z<x>:=PolynomialRing(Integers()); N<r>:=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])];

Crossrefs

Cf. A173299.

Sequence in context: A306918 A027038 A341322 * A173299 A097052 A102937

Adjacent sequences: A173926 A173927 A173928 * A173930 A173931 A173932

Keyword

nonn

Author

Klaus Brockhaus, Mar 02 2010

Status

approved