A216666 Smallest integer b such that (b+1)^p - b^p is prime for all primes p <= prime(n).

1, 1, 1, 1, 6524, 809652228, 30717523794, 55779743835

Offset

1,5

Comments

Is this sequence infinite?

a(9) > 10^11. - Tyler Busby, Feb 20 2023

Links

Table of n, a(n) for n=1..8.

Example

a(1)=a(2)=a(3)=a(4)=1 since 2^2-1, 2^3-1, 2^5-1 and 2^7-1 are primes.

Crossrefs

Cf. A216668.

Sequence in context: A156418 A258521 A068270 * A260979 A034627 A223217

Adjacent sequences: A216663 A216664 A216665 * A216667 A216668 A216669

Keyword

nonn,hard,more

Author

Jean-Louis Charton, Sep 13 2012

Extensions

a(7) from Jean-Louis Charton, Sep 18 2012

a(8) from Jean-Louis Charton, Oct 02 2012

Status

approved