1,1

Table of n, a(n) for n=1..42.

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

Select[Range[1000], PrimeQ[175*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

(PARI) is(n)=ispseudoprime(175*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Sequence in context: A173746 A095803 A036345 * A171381 A274497 A145119

Adjacent sequences: A032461 A032462 A032463 * A032465 A032466 A032467

nonn,hard

N. J. A. Sloane.

a(33)-a(42) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

approved