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
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
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