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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
OFFSET
1,1
COMMENTS
a(20) has 84 digits. Most terms of A173299 are nonprime.
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
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Mar 02 2010
STATUS
approved