A216668 Smallest integer b > 1 such that for all primes p <= prime(n), (b+1)^p - b^p is prime if and only if 2^p-1 is prime.

2, 2, 2, 296, 296, 369719, 457578, 43410300320, 43410300320, 43410300320, 288975248496

Offset

1,1

Links

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

Crossrefs

Cf. A216666.

Sequence in context: A304463 A066736 A324302 * A057330 A207820 A186069

Adjacent sequences: A216665 A216666 A216667 * A216669 A216670 A216671

Keyword

nonn,hard,more

Author

Jean-Louis Charton, Sep 13 2012

Extensions

a(11) from Jean-Louis Charton, Oct 03 2012

Status

approved