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A323042 Numbers k such that 395*2^k+1 is prime. 0
5, 11, 23, 41, 221, 485, 839, 3029, 6479, 15455, 16715, 38399, 38525, 38645, 167501, 185571, 505679, 649445, 764369, 797849, 1106091, 1309751, 1447971, 1480715, 1538975 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Eric Weisstein's World of Mathematics, Proth Prime
MATHEMATICA
Select[Range[1000], PrimeQ[395*2^# + 1] &] (* Robert Price, Jan 03 2019 *)
CROSSREFS
Sequence in context: A262284 A118439 A343711 * A210731 A295959 A156109
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 03 2019
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)