1,1

Some of the larger terms may only correspond to probable primes.

a(12) > 10^5 - Robert Price, Jun 02 2013

Table of n, a(n) for n=1..11.

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

Sequence in context: A259932 A178432 A236068 * A128548 A113606 A209002

Adjacent sequences: A057185 A057186 A057187 * A057189 A057190 A057191

nonn

N. J. A. Sloane, Sep 15 2000

a(11) from Robert Price, Jun 02 2013

approved