OFFSET
1,1
COMMENTS
Corresponding numbers n such that (3^n + 5^n)/8 is prime are listed in A122853. All these numbers are primes. - Alexander Adamchuk, Sep 14 2006
The next term is too large to include. - Alexander Adamchuk, Sep 14 2006
FORMULA
MATHEMATICA
Do[f=5^n+3^n; If[PrimeQ[f/2^3], Print[{n, f/2^3}]], {n, 1, 1231}] (* Alexander Adamchuk, Sep 14 2006 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Sep 10 2006
EXTENSIONS
More terms from Alexander Adamchuk, Sep 14 2006
STATUS
approved