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A050523
Primes of the form 7*2^k-1.
1
13, 223, 3583, 917503, 14680063, 3758096383, 246290604621823, 1340933598257652751063553648756520535666396731910651903
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
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
Adjacent sequences:
A050520
A050521
A050522
*
A050524
A050525
A050526
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 March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)