Many excellent designs for a new banner were submitted. We will use the best of them in rotation.
1,1
Table of n, a(n) for n=1..19.
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
Wilfrid Keller, List of primes k.2^n - 1 for k < 300
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
Sequence in context: A178087 A109286 A009466 * A029988 A050573 A223094
Adjacent sequences: A032476 A032477 A032478 * A032480 A032481 A032482
nonn,hard
N. J. A. Sloane.
approved