A138958 Primes of the form (6^k + 5^k)/11.

31, 991, 1608145354351

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Keywords

• nonn
• hard

Comments

The next term has 308 digits. - Harvey P. Dale, Sep 16 2022

Links

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

Crossrefs

Cf. A128336.

Programs

Mathematica

a={}; Do[p=(6^n+5^n)/11; If[PrimeQ[p], AppendTo[a, p]], {n, 1, 12^2}];a
Select[Table[(6^n+5^n)/11,{n,20}],PrimeQ] (* Harvey P. Dale, Sep 16 2022 *)