A081414 Largest prime divisor of prime(2^n+1) - prime(2^n).

1, 2, 2, 2, 3, 3, 2, 2, 2, 2, 3, 3, 3, 5, 2, 3, 3, 2, 3, 2, 13, 5, 17, 2, 5, 5, 5, 2, 5, 3, 7, 2, 3, 11, 3, 3, 13, 5, 11, 2, 5, 3, 3, 5, 7, 2, 3, 3, 2, 7, 2, 5, 7, 3, 7, 37, 7, 5, 17, 7, 11, 11, 13, 3, 3, 3, 43, 43, 3, 3, 7, 3, 5, 3, 5, 11, 3, 5, 3

Offset: 0

Author

Labos Elemer, Apr 02 2003

Keywords

• nonn

Crossrefs

Cf. A006530, A001223, A000079, A081412, A081413, A074325.

Formula

a(n) = A006530(A001223(A000079(n))) = A081412(2^n) = A006530(A074325(n)).

Extensions

Three more terms from Max Alekseyev, May 15 2009

Offset changed to 0, a(0) prepended and more terms added by Amiram Eldar, Jun 04 2024