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A323009 Numbers k such that 369*2^k+1 is prime. 0
1, 3, 13, 39, 61, 99, 111, 121, 142, 385, 1753, 2203, 2581, 3603, 8674, 10507, 13815, 19231, 49255, 53593, 56754, 73849, 98655, 100710, 171001, 241359, 423535, 617047, 623979, 1209435, 1240510, 2093022, 2846547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

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[369*2^# + 1] &] (* Robert Price, Jan 01 2019 *)

CROSSREFS

Sequence in context: A277411 A054975 A072790 * A328703 A166911 A103657

Adjacent sequences: A323006 A323007 A323008 * A323010 A323011 A323012

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Jan 01 2019

EXTENSIONS

a(32)-a(33) from Jeppe Stig Nielsen, Feb 16 2020

STATUS

approved

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Last modified November 30 19:14 EST 2022. Contains 358453 sequences. (Running on oeis4.)