OFFSET
1,1
COMMENTS
a(27) > 25000. - Robert Price, Apr 10 2017
MATHEMATICA
k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 128], Print[n]; AppendTo[a, n]], {n, 325}]; a
Select[Range[0, 25000], PrimeQ[Product[Prime[k], {k, 1, #}]/2 + 128] &] (* Robert Price, Apr 10 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 21 2008
EXTENSIONS
a(18)-a(24) from Ray Chandler, Jun 16 2013
a(25)-a(26) from Robert Price, Apr 10 2017
STATUS
approved