A177027 Primes of the form 11^n+3^n-1.

13, 19489357, 2357967373, 23225154419887808146560828362864653

Offset: 1

Author

Vincenzo Librandi, Dec 09 2010

Keywords

• nonn
• less

Comments

The next term (a(5)) has 133 digits. - Harvey P. Dale, Jan 18 2024

Crossrefs

Cf. A155623, A177030

Programs

Magma

[ a: n in [0..350] | IsPrime(a) where a is 11^n+3^n-1^n]

Mathematica

Select[Table[11^n+3^n-1,{n,40}],PrimeQ] (* Harvey P. Dale, Jan 18 2024 *)

Formula

a(n) = 11^A177030(n)+3^A177030(n)-1.