A057184 Numbers n such that (18^n + 1)/19 is a prime.

3, 7, 23, 73, 733, 941, 1097, 1933, 4651, 481147

Offset: 1

Author

N. J. A. Sloane, Sep 15 2000

Keywords

• nonn

Links

• J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
• 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
• Paul Bourdelais, A Generalized Repunit Conjecture

Extensions

a(10) = 481147 corresponds to a probable prime, which was found using PFGW v3.3.1. - Paul Bourdelais, Jul 27 2011