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A322960 Numbers k such that 335*2^k+1 is prime. 0
19, 23, 29, 173, 263, 295, 659, 803, 1075, 1087, 1129, 1189, 3173, 4519, 16277, 44425, 67069, 103789, 151319, 189379, 323767, 356029, 409429, 528439, 1335337 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

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(335*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018

MATHEMATICA

Select[Range[1000], PrimeQ[335*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

CROSSREFS

Cf. A002255, A050527.

Sequence in context: A019384 A088987 A217281 * A019360 A269666 A007639

Adjacent sequences:  A322957 A322958 A322959 * A322961 A322962 A322963

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Dec 31 2018

STATUS

approved

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)