OFFSET
1,1
COMMENTS
a(7) > 10^5. - Robert Price, Jun 04 2013
LINKS
H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.
H. Lifchitz, Mersenne and Fermat primes field
PROG
(PARI) isok(n) = (denominator(p=(24^n+1)/25)==1) && isprime(p); \\ Michel Marcus, Oct 30 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 15 2000
STATUS
approved