OFFSET
1,1
COMMENTS
The next term is too large to include here.
MATHEMATICA
a={}; Do[p=(10^n-3^n)/7; If[PrimeQ[p], AppendTo[a, p]], {n, 1, 25^2}]; a
Select[Table[(10^n-3^n)/7, {n, 50}], PrimeQ] (* Harvey P. Dale, Dec 18 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, May 16 2008
STATUS
approved