A138930 Primes of the form (8^n-3^n)/5.

11, 97, 418993, 28823037382718881, 1980704062856484905159341969, 642775217703596110216784836917923148379301630095964749038433, 47428439751604713645494675459558567056117521481173860868835733244342769411181689

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Mathematica

a={}; Do[p=(8^n-3^n)/5; If[PrimeQ[p], AppendTo[a, p]], {n, 1, 10^2}]; a
Select[Table[(8^n-3^n)/5, {n, 100}], PrimeQ] (* Harvey P. Dale, Apr 18 2019 *)

Crossrefs

Cf. A128025.

Sequence in context: A133833 A142260 A016140 * A106136 A223622 A130886

Adjacent sequences: A138927 A138928 A138929 * A138931 A138932 A138933

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Status

approved