OFFSET
1,1
MATHEMATICA
q=9; lst={}; Do[p=Prime[n]; If[PrimeQ[p=2^p-p*q], AppendTo[lst, p]], {n, 5!}]; lst
Select[2^#-9#&/@Prime[Range[50]], PrimeQ] (* Harvey P. Dale, Aug 26 2014 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Vladimir Joseph Stephan Orlovsky, Jan 28 2009
STATUS
approved