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A155846
Primes of the form 2^p-p*q where p is prime,q=5.
3
-7, 7, 1993, 130987, 536870767, 9007199254740727
OFFSET
1,1
MATHEMATICA
q=5; lst={}; Do[p=Prime[n]; If[PrimeQ[p=2^p-p*q], AppendTo[lst, p]], {n, 5!}]; lst
Select[Table[2^p-5p, {p, Prime[Range[50]]}], PrimeQ] (* Harvey P. Dale, Jul 02 2018 *)
KEYWORD
sign
AUTHOR
STATUS
approved