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A050413 Numbers k such that 74*2^k-1 is prime. 2
0, 2552, 4892, 7896, 14352, 32124, 51476 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Equals A050544 minus one; A050544 is the main entry for this sequence. - Jeppe Stig Nielsen, Oct 09 2019
REFERENCES
Computed by Joe K. Crump (joecr(AT)carolina.rr.com) and (mostly) by David Broadhurst.
LINKS
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
PROG
(PARI) is(n)=ispseudoprime(74*2^n-1) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
Sequence in context: A327771 A035876 A072435 * A050544 A185516 A235085
KEYWORD
nonn,hard
AUTHOR
David Broadhurst, Dec 22 1999
EXTENSIONS
David Broadhurst, Dec 26 1999 reports that primality up to n=51476 is now proved, using Yves Gallot's proth.exe.
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)