

A057189


Numbers n such that (23^n+1)/24 is a prime.


14




OFFSET

1,1


COMMENTS

Some of the larger terms may only correspond to probable primes.
a(10) > 10^5.  Robert Price, Jun 04 2013


LINKS

Table of n, a(n) for n=1..9.
H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.


PROG

(PARI) isok(n) = (denominator(p=(23^n+1)/24)==1) && isprime(p); \\ Michel Marcus, Oct 30 2017


CROSSREFS

Sequence in context: A234799 A036295 A132201 * A072580 A186640 A226242
Adjacent sequences: A057186 A057187 A057188 * A057190 A057191 A057192


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Sep 15 2000


EXTENSIONS

a(7)a(9) from Robert Price, Jun 04 2013


STATUS

approved



