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A322956 Numbers k such that 327*2^k+1 is prime. 0
3, 4, 6, 15, 30, 64, 99, 108, 135, 363, 414, 531, 576, 811, 1326, 1414, 1476, 1936, 2371, 3951, 4195, 13324, 21696, 23203, 35790, 46950, 51756, 55174, 61876, 92487, 134104, 691951, 706915, 1743751 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..34.

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

MAPLE

select(n->isprime(327*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018

MATHEMATICA

Select[Range[1000], PrimeQ[327*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

CROSSREFS

Cf. A002255, A050527.

Sequence in context: A129827 A325179 A308533 * A122727 A089249 A173944

Adjacent sequences:  A322953 A322954 A322955 * A322957 A322958 A322959

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Dec 31 2018

STATUS

approved

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Last modified June 23 21:09 EDT 2021. Contains 345402 sequences. (Running on oeis4.)