A323353 Numbers k such that A015525(k) is prime.

2, 3, 7, 11, 13, 73, 401, 421, 677, 3673, 4903, 13147, 24547

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Prog

(PARI) print1(2, ", "); anm2=1; anm1=3; for(n=3, 1000, an=3*anm1+8*anm2; anm2=anm1; anm1=an; if(isprime(an), print1(n, ", ")))
(Perl) use ntheory ":all"; sub isok { is_prob_prime(lucasu(3, -8, $_[0])) }; for (1..700) { print "$_\n" if isok($_) }; # Daniel Suteu, Jan 12 2019

Crossrefs

Cf. A015525, A323354.

Sequence in context: A291657 A113244 A040152 * A188529 A369692 A174060

Adjacent sequences: A323350 A323351 A323352 * A323354 A323355 A323356

Keyword

nonn,more,hard

Author

Hugo Pfoertner, Jan 12 2019

Extensions

a(13) from Daniel Suteu, Jan 12 2019

Status

approved