1,1

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

a(14) > 10^5. - Robert Price, Jun 10 2013

Table of n, a(n) for n=1..13.

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: A262250 A139513 A144593 * A090548 A087309 A127781

Adjacent sequences: A057188 A057189 A057190 * A057192 A057193 A057194

nonn

N. J. A. Sloane, Sep 15 2000

a(12)-a(13) from Robert Price, Jun 10 2013

approved