A322945 - OEIS

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A322945

Numbers k such that 307*2^k+1 is prime.

0

2, 8, 16, 26, 34, 112, 182, 226, 304, 782, 6886, 36422, 647786, 1289306, 2862962

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

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[307*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

CROSSREFS

Cf. A002255, A050527.

Sequence in context: A125259 A169925 A225289 * A157512 A252594 A137882

Adjacent sequences: A322942 A322943 A322944 * A322946 A322947 A322948

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Dec 31 2018

EXTENSIONS

a(15) from Jeppe Stig Nielsen, May 30 2020

STATUS

approved