A322950 Numbers k such that 317*2^k+1 is prime.

7, 11, 243, 291, 327, 1211, 7331, 26775, 101603, 171071, 284795, 295195, 323871, 589755, 833467, 1047471

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Eric Weisstein's World of Mathematics, Proth Prime

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Mathematica

Select[Range[1000], PrimeQ[317*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255,A050527.

Sequence in context: A292791 A106818 A231329 * A201120 A164328 A301736

Adjacent sequences: A322947 A322948 A322949 * A322951 A322952 A322953

Keyword

nonn,more,hard

Author

Robert Price, Dec 31 2018

Status

approved