OFFSET
1,2
COMMENTS
4553899 is also in the sequence. - Felix Fröhlich, Jul 04 2014
LINKS
Author?, 12121 Search [Archived at Wayback Machine].
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
Kosmaj, Riesel list k<300.
PrimeGrid, Announcement of n=4553899 - Felix Fröhlich, Jul 04 2014
MATHEMATICA
Select[Range[2500], PrimeQ[121*2^# - 1] &] (* Michael De Vlieger, Dec 10 2020 *)
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
STATUS
approved