A138941 Primes of the form (13^k - 3^k)/10.

6274633, 3405994336744928448432949523054569, 469545242509890879708897137286442565790534241

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Keywords

• nonn

Comments

The next term (a(4)) has 299 digits. - Harvey P. Dale, Dec 06 2017

Links

• Amiram Eldar, Table of n, a(n) for n = 1..5

Crossrefs

Cf. A128028.

Programs

Mathematica

a={};Do[p=(13^n-3^n)/10;If[PrimeQ[p],AppendTo[a,p]],{n,1,16^2}];a
Select[Table[(13^n-3^n)/10,{n,300}],PrimeQ] (* Harvey P. Dale, Dec 06 2017 *)