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A323147 Numbers k such that 437*2^k+1 is prime. 0
23, 83, 467, 2267, 64835, 105599, 2769299, 2803775 (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
MAPLE
select(k->isprime(437*2^k+1), [$1..3000]); # Muniru A Asiru, Jan 05 2019
MATHEMATICA
Select[Range[1000], PrimeQ[437*2^# + 1] &]
CROSSREFS
Sequence in context: A142790 A288340 A316378 * A262119 A104068 A304839
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 05 2019
EXTENSIONS
a(7)-a(8) from Jeppe Stig Nielsen, Dec 27 2019
STATUS
approved

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)