

A050523


Primes of form 7*2^n1.


1




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..8.
Index entries for sequences of n such that k*2^n1 (or k*2^n+1) is prime


MATHEMATICA

Select[Table[7*2^n1, {n, 0, 200}] , PrimeQ] (* JeanFrançois 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



