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A173929 Primes in A173299. 0
2, 5, 7, 19, 13, 71, 97, 181, 3691, 2521, 191861, 489061, 6811741, 138907099, 708158977, 1321442641, 26947261171, 18405321661, 381765135195632792959100810331957408101589361 (list; graph; refs; listen; history; text; internal format)
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: A099357 A306918 A027038 * A173299 A097052 A102937

Adjacent sequences:  A173926 A173927 A173928 * A173930 A173931 A173932

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Mar 02 2010

STATUS

approved

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Last modified June 18 15:25 EDT 2019. Contains 324213 sequences. (Running on oeis4.)