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A057190
Numbers n such that (24^n+1)/25 is a prime.
14
7, 11, 19, 2207, 2477, 4951
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.
PROG
(PARI) isok(n) = (denominator(p=(24^n+1)/25)==1) && isprime(p); \\ Michel Marcus, Oct 30 2017
CROSSREFS
Sequence in context: A282037 A050562 A321806 * A106674 A184063 A076854
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 15 2000
STATUS
approved