A138956 Primes of the form (4^n + 5^n)/9.

461, 10501, 2149818248341, 20728082811027490541, 481868222983777875077033646523111996342381, 63774650109719491827977851592475862662743267652837460857617262084586443004114519194264814815101

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Mathematica

a={}; Do[p=(4^n+5^n)/9; If[PrimeQ[p], AppendTo[a, p]], {n, 1, 12^2}]; a
Select[Table[(4^n+5^n)/9, {n, 160}], PrimeQ] (* Harvey P. Dale, Oct 22 2011 *)

Crossrefs

Cf. A128335.

Sequence in context: A227994 A142832 A277989 * A107121 A101734 A059025

Adjacent sequences: A138953 A138954 A138955 * A138957 A138958 A138959

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Status

approved