A057190 Numbers k such that (24^k+1)/25 is a prime.

7, 11, 19, 2207, 2477, 4951, 821497

Offset

1,1

Comments

a(7) > 10^5. - Robert Price, Jun 04 2013

Links

Table of n, a(n) for n=1..7.

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

Sequence in context: A282037 A050562 A321806 * A106674 A184063 A076854

Adjacent sequences: A057187 A057188 A057189 * A057191 A057192 A057193

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 15 2000

Extensions

a(7) from Paul Bourdelais, Jan 06 2025

Status

approved