OFFSET
1,1
COMMENTS
a(28) > 25000. - Robert Price, Jan 01 2017
MATHEMATICA
k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 8], Print[n]; AppendTo[a, n]], {n, 404}]; a
(* Second program *)
Select[Range[10^3], PrimeQ[(Times @@ Prime@ Range@ #)/2 + 8] &] (* Michael De Vlieger, Jan 01 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 21 2008
EXTENSIONS
a(18)-a(21) from Ray Chandler, Jun 16 2013
a(22)-a(27) from Robert Price, Jan 01 2017
STATUS
approved