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A050523 Primes of the form 7*2^k-1. 1
13, 223, 3583, 917503, 14680063, 3758096383, 246290604621823, 1340933598257652751063553648756520535666396731910651903 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[7*2^n-1, {n, 0, 200}], PrimeQ] (* Jean-François Alcover, Mar 20 2011 *)
CROSSREFS
See A001771 for more terms.
Cf. A158795 [Vincenzo Librandi, Mar 28 2009]
Sequence in context: A178559 A068120 A237602 * A160196 A218588 A158518
KEYWORD
nonn,nice
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
13 inserted by R. J. Mathar, Apr 01 2009
STATUS
approved

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Last modified July 24 18:12 EDT 2024. Contains 374585 sequences. (Running on oeis4.)